I think I may have cracked the compile-ahead-of-time-splice-at-runtime nut.
This compiles stages ahead of time using clang, then splices them together at runtime. This means the stages can be written in simple C++, with some mild restrictions.
This performs identically to our Xbyak experiment, and already supports more stages. As written this stands alone from SkRasterPipeline_opts.h, but I'm fairly confident that the bulk (the STAGE implementations) can ultimately be shared.
As of PS 25 or so, this also supports all the stages used by bench/SkRasterPipelineBench.cpp:
SkRasterPipeline_…
400 …f16_compile 1x …f16_run 1.38x …srgb_compile 1.89x …srgb_run 2.21x
That is, ~30% faster than baseline for f16, ~15% faster for sRGB.
Change-Id: I1ec7dcb769613713ce56978c58038f606f87d63d
Reviewed-on: https://skia-review.googlesource.com/6733
Reviewed-by: Herb Derby <herb@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
A little JIT proof of concept for SkRasterPipeline, using xbyak, which is a header-only assembler. It's x86-only, but supports x86 very thoroughly, and it's very user friendly (at least as far as assembler libraries go...).
CQ_INCLUDE_TRYBOTS=skia.primary:Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Release-SKNX_NO_SIMD
Change-Id: Ie17e562b0f3fff5914041badfb2c1fe4f86efab8
Reviewed-on: https://skia-review.googlesource.com/5730
Reviewed-by: Herb Derby <herb@google.com>
Reviewed-by: Heather Miller <hcm@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
E.g.
$ ninja -C out push_dm
By default (ninja -C out) everything is built and pushed if skia_android_serial
is set. Dependencies are tracked, so incremental builds push only executables
that have changed.
Change-Id: I586d81791f5f877b173cf61ed68fa9aab96234d2
Reviewed-on: https://skia-review.googlesource.com/6616
Reviewed-by: Derek Sollenberger <djsollen@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
Change-Id: I6e7f41df094ae037538ebd61e40385d7e2e9eb26
Reviewed-on: https://skia-review.googlesource.com/6615
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Mike Klein <mtklein@chromium.org>
This template encapsulates two common features of our test apps:
- they set testonly, marking them as safe to use testonly libraries
- they may want instead to be libapp.so on Android.
I plan to follow up to make test_apps push themselves to an Android device when a new argument android_serial is set.
Change-Id: I010d219c14ff6d0cd6a543dd56fd471a67ddb6f1
Reviewed-on: https://skia-review.googlesource.com/6608
Reviewed-by: Derek Sollenberger <djsollen@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
BUG=skia:
Change-Id: Icf616bec73e81aad97815b519566ff5b9db611e3
Reviewed-on: https://skia-review.googlesource.com/6495
Commit-Queue: Hal Canary <halcanary@google.com>
Reviewed-by: Mike Klein <mtklein@chromium.org>
This forces all of our testing tools to run with the discrete GPU in
laptop systems that have that option.
BUG=skia:
Change-Id: Ibd7629d6de5f063cdf219b3c7469210af5085d90
Reviewed-on: https://skia-review.googlesource.com/6474
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Brian Osman <brianosman@google.com>
There are only a couple of these, primarily focused on index8 srcs and 565 dsts. The burden's starting to outweigh the benefit. No one on the team knows MIPS assembly.
If we're going to try this again, I'd rather we try some sort of SkNx / compiler-intrinsic based approach, probably targeting MIPS SIMD (MSA), not this older instruction set.
We already ignore these files for 64-bit MIPS. This just closes the loop on 32-bit MIPS.
CQ_INCLUDE_TRYBOTS=skia.primary:Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Release-SKNX_NO_SIMD,Build-Ubuntu-Clang-mips64el-Debug-Android,Build-Ubuntu-Clang-mips64el-Release-Android,Build-Ubuntu-Clang-mipsel-Debug-Android,Build-Ubuntu-Clang-mipsel-Release-Android
BUG=skia:6065
Change-Id: Iecac15b56f59625b2e743ea36e7791b90bb0b422
Reviewed-on: https://skia-review.googlesource.com/6353
Reviewed-by: Leon Scroggins <scroggo@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
Change-Id: Ib831b9a6bcf4f37c0f077b26f68b1cefef81bb73
Reviewed-on: https://skia-review.googlesource.com/6351
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
Motivation: Since I am activly refactoring SkXPS, I will be needing to
add and subtract sources. This is the only way to keep chrome and skia
in sync.
TODO(halcanry): follow up in Chrome build files.
BUG=skia:3495
Change-Id: I2bfcbfce7628c34f9a623c6fa806374a10cdbb75
Reviewed-on: https://skia-review.googlesource.com/6350
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Hal Canary <halcanary@google.com>
This reverts commit ada12ab055.
Reason for revert: Google3 needs it:
https://test.corp.google.com/ui#id=OCL:142184832:BASE:142184975:1481839118985:32fde8ef
Original change's description:
> Remove all KTX support
>
> It is untested and unused.
>
> Change-Id: I010ff4ad942738f362d42a99af4edbbb1cb0cd71
> Reviewed-on: https://skia-review.googlesource.com/6142
> Commit-Queue: Leon Scroggins <scroggo@google.com>
> Reviewed-by: Mike Klein <mtklein@chromium.org>
> Reviewed-by: Robert Phillips <robertphillips@google.com>
>
TBR=mtklein@chromium.org,mtklein@google.com,robertphillips@google.com,scroggo@google.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
Change-Id: I1ea2f9487eb2212efbfcc514122792b70c9e8737
Reviewed-on: https://skia-review.googlesource.com/6181
Commit-Queue: Leon Scroggins <scroggo@google.com>
Reviewed-by: Leon Scroggins <scroggo@google.com>
It is untested and unused.
Change-Id: I010ff4ad942738f362d42a99af4edbbb1cb0cd71
Reviewed-on: https://skia-review.googlesource.com/6142
Commit-Queue: Leon Scroggins <scroggo@google.com>
Reviewed-by: Mike Klein <mtklein@chromium.org>
Reviewed-by: Robert Phillips <robertphillips@google.com>
It escaped the chopping block when we deleted the decoder, but it is
currently untested and unused as far as we know. In addition to
removing effectively unsupported code, this simplifies build file
changes (i.e. don't build it on Android framework, but build it
elsewhere) as we narrow our build systems down to one.
Change-Id: I3b960fdcc369fb947be282933ddba48e407ab3ad
Reviewed-on: https://skia-review.googlesource.com/6031
Reviewed-by: Robert Phillips <robertphillips@google.com>
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Leon Scroggins <scroggo@google.com>
This reverts commit eeb7137a0b.
Reason for revert: well, duh, I guess we'd better update the GYP and Google3 builds...
Original change's description:
> Do not build the ktx encoder for android framework
>
> Move SkKTXImageEncoder.cpp into an optional block, and disable that
> block for the android framework. Use a new define to determine whether
> to define the entry point, rather than using
> SK_BUILD_FOR_ANDROID_FRAMEWORK.
>
> Change-Id: I41103459135af744cf5715f27783c63dc37a7ad1
> Reviewed-on: https://skia-review.googlesource.com/5982
> Commit-Queue: Leon Scroggins <scroggo@google.com>
> Commit-Queue: Mike Klein <mtklein@chromium.org>
> Reviewed-by: Mike Klein <mtklein@chromium.org>
>
TBR=mtklein@chromium.org,mtklein@google.com,scroggo@google.com,reviews@skia.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
Change-Id: I8da75db31884b5148f7f85a6a0c3e6913b71cfa8
Reviewed-on: https://skia-review.googlesource.com/6021
Commit-Queue: Mike Klein <mtklein@chromium.org>
Reviewed-by: Mike Klein <mtklein@chromium.org>
Move SkKTXImageEncoder.cpp into an optional block, and disable that
block for the android framework. Use a new define to determine whether
to define the entry point, rather than using
SK_BUILD_FOR_ANDROID_FRAMEWORK.
Change-Id: I41103459135af744cf5715f27783c63dc37a7ad1
Reviewed-on: https://skia-review.googlesource.com/5982
Commit-Queue: Leon Scroggins <scroggo@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
Reviewed-by: Mike Klein <mtklein@chromium.org>
Instead of relying on cpu-features.c, just do what it does.
Good reading: http://man7.org/linux/man-pages/man3/getauxval.3.html
While it's nice to use the headers when possible, should either of these headers not be available, we can fall back to doing it all manually:
extern "C" uint32_t getauxval(uint32_t)
static const int AT_HWCAP = 16;
static const int HWCAP_CRC32 = (1<<7);
To keep things simple I've slimmed cpu feature detection down to just the features we actually make use of. This removes all runtime feature detection for ARMv7... we expect NEON to be globally available, and so far we haven't used the other FMA/FP16 bits on ARMv7. ARMv8 feature dection remains the same, CRC32 before, CRC32 after. x86 (cpuid-based detection) and MIPS (nothing) are untouched.
We need to keep //third_party/cpu-features for //third_party/libwebp.
Change-Id: I6c96df9a09ae68c8c0e54c1152aa177ba9bafc83
Reviewed-on: https://skia-review.googlesource.com/5800
Reviewed-by: Derek Sollenberger <djsollen@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
in response to 5784
Change-Id: I3ad34a30743e7ffbd04767668c288a4f884eb19c
Reviewed-on: https://skia-review.googlesource.com/5732
Reviewed-by: Leon Scroggins <scroggo@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
This spins off parts of 5620 to bake while we work through how to do the rest of libviewer.so -> viewer.apk.
Change-Id: I1cbf135cc952eeb7593e80a5a752dcadaa2dbb00
Reviewed-on: https://skia-review.googlesource.com/5656
Reviewed-by: Derek Sollenberger <djsollen@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
The general idea here is, run GN in --ide=json mode to get most information.
Then, read a couple .gni files to get the rest (platform specific source lists, Android framework defines).
For now, I'm generating Android.bp and SkUserConfig.h. I figure we can do DM and nanobench once these work?
Change-Id: I8e7f60d6572f2d4769760cf872895518a15d841b
Reviewed-on: https://skia-review.googlesource.com/5554
Reviewed-by: Leon Scroggins <scroggo@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
The code in views and samplecode wasn't being compiled in. Expand the
scope of the SK_ANGLE define to fix that. Add some missing deps too.
BUG=skia:
Change-Id: Id7b584457a21f171efc2339fb969c550379295e5
Reviewed-on: https://skia-review.googlesource.com/5575
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Mike Klein <mtklein@chromium.org>
Also, no more SkImageEncoder class.
SK_SUPPORT_LEGACY_IMAGE_ENCODER_CLASS now only guards some
old API shims.
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=5006
Change-Id: I3797f584f3e8e12ade10d31e8733163453725f40
Reviewed-on: https://skia-review.googlesource.com/5006
Commit-Queue: Hal Canary <halcanary@google.com>
Reviewed-by: Leon Scroggins <scroggo@google.com>
Reviewed-by: Mike Reed <reed@google.com>
(re-land 248ff02 & 2cb6cb7, with changes)
- Hide SkImageEncoder class in private header.
- SkImageEncoder::Type becomes SkEncodedImageFormat
- SkEncodedFormat becomes SkEncodedImageFormat
- SkImageEncoder static functions replaced with
single function EncodeImage()
- utility wrappers for EncodeImage() are in
sk_tool_utils.h
TODO: remove link-time registration mechanism.
TODO: clean up clients use of API and flip the flag.
TODO: implement EncodeImage() in chromeium/skia/ext
Change-Id: I47d451e50be4d5c6c130869c7fa7c2857243d9f0
Reviewed-on: https://skia-review.googlesource.com/4909
Reviewed-by: Mike Reed <reed@google.com>
Reviewed-by: Leon Scroggins <scroggo@google.com>
Reviewed-on: https://skia-review.googlesource.com/5186
Commit-Queue: Hal Canary <halcanary@google.com>
Reviewed-by: Hal Canary <halcanary@google.com>
- Hide SkImageEncoder class in private header.
- SkImageEncoder::Type becomes SkEncodedImageFormat
- SkEncodedFormat becomes SkEncodedImageFormat
- SkImageEncoder static functions replaced with
single function EncodeImage()
- utility wrappers for EncodeImage() are in
sk_tool_utils.h
TODO: remove link-time registration mechanism.
TODO: clean up clients use of API and flip the flag.
TODO: implement EncodeImage() in chromeium/skia/ext
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=4909
Change-Id: Ib48b31fdc05cf23cda7f56ebfd67c841c149ce70
Reviewed-on: https://skia-review.googlesource.com/4909
Reviewed-by: Mike Reed <reed@google.com>
Reviewed-by: Leon Scroggins <scroggo@google.com>
Commit-Queue: Hal Canary <halcanary@google.com>
This reverts commit c89e2438ae.
Reason for revert:
I'm going to stub this code out in Chrome instead for now. Chrome's not going to land something that looks like this, so I'd rather undo it than leave Skia in this odd state.
Original change's description:
> Turn off /arch:AVX[2] on Windows builds.
>
> This canaries a similar change Chrome may need.
>
> BUG=chromium:666707
>
> GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=5005
>
> Change-Id: Ibf7f9941968d905d865b9be1e63ebbf768870175
> Reviewed-on: https://skia-review.googlesource.com/5005
> Reviewed-by: Mike Klein <mtklein@chromium.org>
> Commit-Queue: Mike Klein <mtklein@chromium.org>
>
TBR=mtklein@chromium.org,brucedawson@chromium.org,reviews@skia.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
Change-Id: I9562f7877749c61f6ba4d48d6c4b557f09876128
Reviewed-on: https://skia-review.googlesource.com/5069
Commit-Queue: Mike Klein <mtklein@chromium.org>
Reviewed-by: Mike Klein <mtklein@chromium.org>
This leaves libskia as the only thing we build when tools are not enabled (other GN environments like Fuchsia, Flutter, Chrome, or for people using ours and actively disabling tools).
BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=4993
Change-Id: I5acad66c1b068ef81c1a7e292c3524a0b1497b66
Reviewed-on: https://skia-review.googlesource.com/4993
Reviewed-by: Joe Gregorio <jcgregorio@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
This canaries a similar change Chrome may need.
BUG=chromium:666707
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=5005
Change-Id: Ibf7f9941968d905d865b9be1e63ebbf768870175
Reviewed-on: https://skia-review.googlesource.com/5005
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Mike Klein <mtklein@chromium.org>
skia.h includes GPU headers. No real point in getting fancy here... if there are no unused parameters in all headers, there are no unused parameters in the subset of non-GPU headers.
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=4916
Change-Id: Iaaea405633aabcc82e40cd4b1a2286aadd5cea17
Reviewed-on: https://skia-review.googlesource.com/4916
Reviewed-by: Mike Klein <mtklein@chromium.org>
Reviewed-by: Derek Sollenberger <djsollen@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
We already generate skia.h to include all public headers for Fiddle.
This just includes it with -Wunused-parameter turned on as an error.
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=4901
Change-Id: Ia55a901c09a3c9c9d6d35a43259431dba3532ed9
Reviewed-on: https://skia-review.googlesource.com/4901
Reviewed-by: Derek Sollenberger <djsollen@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
This reverts commit 238b820369.
Reason for revert: breaks 32-bit bots, iOS bots, Google3 roll, -ASAN bot.
Original change's description:
> Always build the ANGLE test code. Always build ANGLE on windows and linux.
>
> Make ANGLE test code independent of having ANGLE lib. Make ANGLE test code not include EGL headers.
>
> GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=4040
>
> DOCS_PREVIEW= https://skia.org/?cl=4040
>
> Change-Id: I7b857e9785246743f53fb969647b1162ce7419ab
> Reviewed-on: https://skia-review.googlesource.com/4040
> Commit-Queue: Brian Salomon <bsalomon@google.com>
> Reviewed-by: Mike Klein <mtklein@chromium.org>
>
TBR=mtklein@chromium.org,mtklein@google.com,bsalomon@google.com,reviews@skia.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
Change-Id: I19bab8c93baebf032f8a4cefbedfe7359317e806
Reviewed-on: https://skia-review.googlesource.com/4758
Commit-Queue: Mike Klein <mtklein@chromium.org>
Reviewed-by: Mike Klein <mtklein@chromium.org>
These libraries aren't configured in Fuchsia and would need some GN
reworking to enable. We can wire this up in Fuchsia if/when this
capability when needed.
Change-Id: Iec2d339da07f44516592d6114563a8a4fb59d952
Reviewed-on: https://skia-review.googlesource.com/4744
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Mike Klein <mtklein@chromium.org>
(1) Compile tool with GN.
(2) Rename tool to colorspaceinfo.
(3) Support both images and icc profiles as input.
(4) Print out information on transfer fn in addition to gamut.
TODO: Output graphs of the three transfer fn curves.
BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=4721
Change-Id: I2e75139685ea41446d3ae6f9803c8068ea05661a
Reviewed-on: https://skia-review.googlesource.com/4721
Commit-Queue: Matt Sarett <msarett@google.com>
Reviewed-by: Mike Klein <mtklein@chromium.org>
Reviewed-by: Brian Osman <brianosman@google.com>
When we opt into Lua, this builds SampleLua into SampleApp, and the lua_app and lua_pictures tools.
I've tested this builds with and without skia_use_system_lua on my Mac laptop and Linux desktop.
I've made lua_pictures.cpp's flags static to avoid conflicts with flags in SkCommonFlags.cpp.
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=4699
DOCS_PREVIEW= https://skia.org/?cl=4699
Change-Id: I8176fd51d8a38746e7d730cfcce66da42b9a015a
Reviewed-on: https://skia-review.googlesource.com/4699
Reviewed-by: Hal Canary <halcanary@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
This reverts commit 7234448c11.
Reason for revert: this enabled tests which are making the bots flaky.
Original change's description:
> GN: define SK_XML to indicate :xml is enabled.
>
> Without this, nothing ever defines SK_XML for dm/DM.cpp, dm/DMSrcSink.cpp, tests/SkDOMTest.cpp or tests/SkPEGTest.cpp.
>
> GYP does something similiar in gyp/xml.gyp.
>
> BUG=skia:
>
> GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=4500
>
> Change-Id: I93322722d6d86f5802495d7a2edad2f82ba36f69
> Reviewed-on: https://skia-review.googlesource.com/4500
> Reviewed-by: Hal Canary <halcanary@google.com>
> Commit-Queue: Eric Boren <borenet@google.com>
> Commit-Queue: Mike Klein <mtklein@chromium.org>
>
TBR=mtklein@chromium.org,borenet@google.com,halcanary@google.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
Change-Id: I46c198f4985f6e7f96c07b3100a3877ba46fdb18
Reviewed-on: https://skia-review.googlesource.com/4526
Commit-Queue: Mike Klein <mtklein@chromium.org>
Reviewed-by: Mike Klein <mtklein@chromium.org>
Without this, nothing ever defines SK_XML for dm/DM.cpp, dm/DMSrcSink.cpp, tests/SkDOMTest.cpp or tests/SkPEGTest.cpp.
GYP does something similiar in gyp/xml.gyp.
BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=4500
Change-Id: I93322722d6d86f5802495d7a2edad2f82ba36f69
Reviewed-on: https://skia-review.googlesource.com/4500
Reviewed-by: Hal Canary <halcanary@google.com>
Commit-Queue: Eric Boren <borenet@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
This doesn't create any apps or bundles or sign anything, but it all compiles and links.
Note the awkward transitional hack I used to make each tool's tool_main() serve as the real main() again when built with GN, while keeping the existing setup with GYP. Fun...
BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=4350
Change-Id: I632753d5d8e5848380854f413bf5905d676bfcf4
Reviewed-on: https://skia-review.googlesource.com/4350
Reviewed-by: Jim Van Verth <jvanverth@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
This moves the work of finding headers from `gn gen` time into the action itself. We can do this safely now because we're constructing a skia.h.d deps file, which Ninja uses to track if-these-are-dirty-then-this-is-dirty relationships. Everything can now live in one handy find_headers.py.
Upshot is, `gn gen` runs ~50ms faster, and I think the code's clearer this way too.
BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=4065
Change-Id: I2f1e7adf68be8e961eb77596786a795134bbb9a6
Reviewed-on: https://skia-review.googlesource.com/4065
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
signalBoring() no longer exists. When the fuzzer runs out of randomness,
it just returns 0. Fuzzers should not go into infinite loops if this
happens. do while loops are particularly error-prone.
BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=3963
Change-Id: Iebcfc14cc6b0a19c5dd015cd39875c81fa44003e
Reviewed-on: https://skia-review.googlesource.com/3963
Commit-Queue: Kevin Lubick <kjlubick@google.com>
Reviewed-by: Mike Klein <mtklein@chromium.org>
This extends the pattern in freetype2 to expat, icu, libjpeg-turbo, libpng, libwebp, and zlib, and gives all these an arg to control which to use.
Homebrew doesn't have dng_sdk, piex, or sftnly, or I'd have done the same for them too.
BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=4260
DOCS_PREVIEW= https://skia.org/?cl=4260
Change-Id: I82e780502bf2217336e791787f172a6fc8f55460
Reviewed-on: https://skia-review.googlesource.com/4260
Commit-Queue: Mike Klein <mtklein@chromium.org>
Reviewed-by: Hal Canary <halcanary@google.com>
Add BUILD.gn files for dng_sdk and piex and updated BUILD.gn to
build SkRawCodec.
We stopped testing raw images when we switched to GN, so this will
bring back our testing.
Leave SkRawCodec disabled on Windows, where we've had problems in the
past.
Originally landed in issue 4603. Reverted due to build errors.
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2463433002
Review-Url: https://codereview.chromium.org/2463433002
