Commit Graph

30 Commits

Author SHA1 Message Date
Andreas Haas
cde2a6c72e [wasm] Support initial value for Table.grow
An initial value for Table.grow is supported by the core spec and does
not depend on a proposal, see [1].

[1] https://webassembly.github.io/spec/js-api/index.html#tables

R=thibaudm@chromium.org

Bug: v8:12227
Change-Id: Ia4f16adc76a0422b2211c069614929a1a70afa76
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3164979
Reviewed-by: Thibaud Michaud <thibaudm@chromium.org>
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/main@{#76905}
2021-09-17 12:55:14 +00:00
Andreas Haas
b01d2f456f Reland "[wasm][externref] Support default value for the table.set"
Reason for revert: There was an out-dated wpt test in blink that
failed after this CL. I adjusted the test expectations in https://chromium-review.googlesource.com/c/chromium/src/+/3162980 so that I can land this CL.

Original change's description:
> Revert "[wasm][externref] Support default value for the table.set"
>
> This reverts commit 6b57898062.
>
> Reason for revert: Fails layout tests: https://ci.chromium.org/ui/p/v8/builders/ci/V8%20Blink%20Linux/13751/overview
>
> Original change's description:
> > [wasm][externref] Support default value for the table.set
> >
> > WebAssembly.Table.set allows a default value instead of the second
> > parameter, which was not supported by V8 so far.
> >
> > R=​thibaudm@chromium.org
> >
> > Bug: v8:7581
> > Change-Id: I417790722b1cb4f854cd0056ecb8377c330c45fa
> > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3141574
> > Reviewed-by: Thibaud Michaud <thibaudm@chromium.org>
> > Commit-Queue: Andreas Haas <ahaas@chromium.org>
> > Cr-Commit-Position: refs/heads/main@{#76846}
>
> Bug: v8:7581
> Change-Id: I83d9be59c66ece3184b5708e5b8a3b401e4938ed
> No-Presubmit: true
> No-Tree-Checks: true
> No-Try: true
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3163257
> Auto-Submit: Clemens Backes <clemensb@chromium.org>
> Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
> Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
> Cr-Commit-Position: refs/heads/main@{#76852}

Bug: v8:7581
Change-Id: I248f836ba4de2a4e3f3d80c00e6f1ac0b46a38d7
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3162608
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Reviewed-by: Thibaud Michaud <thibaudm@chromium.org>
Cr-Commit-Position: refs/heads/main@{#76873}
2021-09-16 13:03:41 +00:00
Clemens Backes
46540df8fd Revert "[wasm][externref] Support default value for the table.set"
This reverts commit 6b57898062.

Reason for revert: Fails layout tests: https://ci.chromium.org/ui/p/v8/builders/ci/V8%20Blink%20Linux/13751/overview

Original change's description:
> [wasm][externref] Support default value for the table.set
>
> WebAssembly.Table.set allows a default value instead of the second
> parameter, which was not supported by V8 so far.
>
> R=​thibaudm@chromium.org
>
> Bug: v8:7581
> Change-Id: I417790722b1cb4f854cd0056ecb8377c330c45fa
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3141574
> Reviewed-by: Thibaud Michaud <thibaudm@chromium.org>
> Commit-Queue: Andreas Haas <ahaas@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#76846}

Bug: v8:7581
Change-Id: I83d9be59c66ece3184b5708e5b8a3b401e4938ed
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3163257
Auto-Submit: Clemens Backes <clemensb@chromium.org>
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#76852}
2021-09-15 17:03:11 +00:00
Andreas Haas
6b57898062 [wasm][externref] Support default value for the table.set
WebAssembly.Table.set allows a default value instead of the second
parameter, which was not supported by V8 so far.

R=thibaudm@chromium.org

Bug: v8:7581
Change-Id: I417790722b1cb4f854cd0056ecb8377c330c45fa
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3141574
Reviewed-by: Thibaud Michaud <thibaudm@chromium.org>
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/main@{#76846}
2021-09-15 14:12:18 +00:00
Camillo Bruni
a345a442d3 [d8][mjsunit][tools] Improve d8 file API
- Add d8.file.read() and d8.file.execute() helpers
- Change tools and tests to use new d8.file helper
- Unify error throwing in v8::Shell::ReadFile

Change-Id: I5ef4cb27f217508a367106f01e872a4059d5e399
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2928505
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Reviewed-by: Maya Lekova <mslekova@chromium.org>
Reviewed-by: Marja Hölttä <marja@chromium.org>
Cr-Commit-Position: refs/heads/master@{#74883}
2021-06-01 13:37:57 +00:00
Andreas Haas
4743426571 [wasm] Check size of tables dynamically
We used to check the size of tables at compile time, and threw a
CompilationError if a given size exceeded the implementation-defined
limit. However, the spec defines that an error should only be thrown
when the implementation-defined limit is reached, which is either at
instantiation time of during runtime at a table.grow.

With this CL the V8 implementation becomes spec compliant in this
regard.

R=jkummerow@chromium.org

Bug: v8:10556
Change-Id: I7d0e688b385a65e4060a569e5ab1dec68947ceea
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2326331
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69267}
2020-08-06 11:50:43 +00:00
Sven Sauleau
f4e322c3dd [wasm] correct Table limit
Align the Table implementation limits with the JavaScript Embedding
limits defined in the specification (from MAX_UINT32 to 1e7).

Introduce a new helper (max_table_init_entries) that returns the
maximum number of Table entry at initialization. It takes into account
the maximum Table size, which can be passed by a flag.

Bug: v8:8633
Change-Id: Idfa19418e81f478f7886a30876e66c9b216e25ac
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1496971
Commit-Queue: Sven Sauleau <ssauleau@igalia.com>
Reviewed-by: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60036}
2019-03-05 15:22:20 +00:00
Sven Sauleau
5bdb13297f [wasm] merge js constants file in module-builder
We noticed that almost every call site were loading both files,
the split isn't necessary anymore.

In some message tests, removed the absolute line number to allow future
changes.

Bug: v8:8726
Change-Id: I8527f0a1ecfa685aa01a5e2f5f47ddf1cb13a545
Reviewed-on: https://chromium-review.googlesource.com/c/1446452
Commit-Queue: Sven Sauleau <ssauleau@igalia.com>
Reviewed-by: Ben Titzer <titzer@chromium.org>
Reviewed-by: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#59220}
2019-01-30 22:10:34 +00:00
Sven Sauleau
0e9e8164c2 [wasm] fix js-api table/get-set
Fix WebAssembly's table/get-set js-api. The argument is a unsigned long,
this change refactors most of arithmetic and bounds checks type from
int64 to uint32_t, according to the spec.

Bug: v8:8319
Change-Id: I088f631c6805b0e5ba29089b08ea15e78fe5852d
Cq-Include-Trybots: luci.chromium.try:linux-blink-rel
Reviewed-on: https://chromium-review.googlesource.com/c/1414914
Reviewed-by: Adam Klein <adamk@chromium.org>
Reviewed-by: Deepti Gandluri <gdeepti@chromium.org>
Commit-Queue: Sven Sauleau <ssauleau@igalia.com>
Cr-Commit-Position: refs/heads/master@{#58941}
2019-01-19 09:15:37 +00:00
Sven Sauleau
fc27711780 [wasm] fix js-api table/grow
Fix WebAssembly's table/grow js-api. The argument is a unsigned long,
this change refactors most of arithmetic and bounds checks type from
int64 to uint32_t, according to the spec.

Bug: v8:8319
Cq-Include-Trybots: luci.chromium.try:linux-blink-rel
Change-Id: Ia29121c930d7fb930668e54a5a769dae25234f2c
Reviewed-on: https://chromium-review.googlesource.com/c/1351006
Commit-Queue: Sven Sauleau <ssauleau@igalia.com>
Reviewed-by: Adam Klein <adamk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58936}
2019-01-18 20:19:51 +00:00
Sven Sauleau
ff6544c5b0 [wasm] fix js-api Memory and Table constructor
Fix and re-enable tests for WebAssembly's memory/constructor and
table/constructor js-api.

It introduces the '[EnforceRange] unsigned long' algorithm used
to validate initial and maximum properties.

The initial property is now required, by the switch to the Web IDL
specification. Most of the input validations errors are now considered
TypeError instead of RangeError.

The WasmTableObject and WasmMemoryObject APIs use more consistently uint32_t
to ensure integer range and remove the need for bounds checks.

Cq-Include-Trybots: luci.chromium.try:linux-blink-rel
Bug: v8:8319
Change-Id: Iedd3ee6484ef688a5e96f93006eb6ca66d805a48
Reviewed-on: https://chromium-review.googlesource.com/c/1354043
Commit-Queue: Adam Klein <adamk@chromium.org>
Reviewed-by: Adam Klein <adamk@chromium.org>
Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58138}
2018-12-10 23:32:05 +00:00
Michael Starzinger
a64e6b5062 [wasm][test] Add additional module builder checks.
R=clemensh@chromium.org

Change-Id: I9734259c9f41378ac216d5a222f0f7c71fcb5fa6
Reviewed-on: https://chromium-review.googlesource.com/1219023
Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55781}
2018-09-11 09:56:44 +00:00
Choongwoo Han
c65792128c [wasm] get length at the right time Table.p.grow
Get the old table size after converting integer of 'delta' argument.
Converting integer of the argument can execute another javascript code,
and the code can trigger mismatching between table sizes of instance and
table object, which causes redundant memory allocation.

http://webassembly.org/docs/js/#webassemblytableprototypegrow

Bug: chromium:752423
Change-Id: If9a576d20625d0c39342ea5de114e9fc9f230125
Reviewed-on: https://chromium-review.googlesource.com/627248
Reviewed-by: Ben Titzer <titzer@chromium.org>
Commit-Queue: Ben Titzer <titzer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#47641}
2017-08-28 11:27:46 +00:00
titzer
0c22df6555 [wasm] Allow full u32 range for table maximum in WebAssembly.Table constructor.
R=clemensh@chromium.org
BUG=chromium:740199

Review-Url: https://codereview.chromium.org/2977543002
Cr-Commit-Position: refs/heads/master@{#46508}
2017-07-10 11:18:45 +00:00
titzer
8d76f0e346 [wasm] Enforce memory and table limits during instantiation.
R=rossberg@chromium.org
BUG=chromium:575167

Review-Url: https://codereview.chromium.org/2636173002
Cr-Commit-Position: refs/heads/master@{#42426}
2017-01-17 19:15:59 +00:00
titzer
7d42244a7e [wasm] Enforce that function bodies end with the \"end\" opcode.
R=rossberg@chromium.org
BUG=chromium:575167

Review-Url: https://codereview.chromium.org/2630553002
Cr-Original-Original-Commit-Position: refs/heads/master@{#42286}
Committed: fcc6e85ec6
Review-Url: https://codereview.chromium.org/2630553002
Cr-Original-Commit-Position: refs/heads/master@{#42315}
Committed: 74a2f9b7d3
Review-Url: https://codereview.chromium.org/2630553002
Cr-Commit-Position: refs/heads/master@{#42350}
2017-01-15 21:18:53 +00:00
titzer
3badb2369d Revert of [wasm] Enforce that function bodies end with the \"end\" opcode. (patchset #6 id:100001 of https://codereview.chromium.org/2630553002/ )
Reason for revert:
Still breaks Win64 clang build.

Original issue's description:
> [wasm] Enforce that function bodies end with the \"end\" opcode.
>
> R=rossberg@chromium.org
> BUG=chromium:575167
>
> Review-Url: https://codereview.chromium.org/2630553002
> Cr-Original-Commit-Position: refs/heads/master@{#42286}
> Committed: fcc6e85ec6
> Review-Url: https://codereview.chromium.org/2630553002
> Cr-Commit-Position: refs/heads/master@{#42315}
> Committed: 74a2f9b7d3

TBR=mtrofin@chromium.org,rossberg@chromium.org,jbroman@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:575167

Review-Url: https://codereview.chromium.org/2636463002
Cr-Commit-Position: refs/heads/master@{#42317}
2017-01-13 11:32:17 +00:00
titzer
74a2f9b7d3 [wasm] Enforce that function bodies end with the \"end\" opcode.
R=rossberg@chromium.org
BUG=chromium:575167

Review-Url: https://codereview.chromium.org/2630553002
Cr-Original-Commit-Position: refs/heads/master@{#42286}
Committed: fcc6e85ec6
Review-Url: https://codereview.chromium.org/2630553002
Cr-Commit-Position: refs/heads/master@{#42315}
2017-01-13 10:50:06 +00:00
littledan
77f80d0f96 Revert of [wasm] Enforce that function bodies end with the \"end\" opcode. (patchset #1 id:1 of https://codereview.chromium.org/2628203003/ )
Reason for revert:
OK, the failure really does seem to be due to this patch: It triggers Clang to crash

FAILED: obj/test/unittests/unittests/function-body-decoder-unittest.obj
E:\b\build\slave\cache\cipd\goma/gomacc.exe ../../third_party/llvm-build/Release+Asserts/bin/clang-cl.exe /nologo /showIncludes /FC @obj/test/unittests/unittests/function-body-decoder-unittest.obj.rsp /c ../../test/unittests/wasm/function-body-decoder-unittest.cc /Foobj/test/unittests/unittests/function-body-decoder-unittest.obj /Fd"obj/test/unittests/unittests_cc.pdb"
Assertion failed: (NumGaps == 0 || Bias < MaxDefRange) && "large ranges should not have gaps", file E:\b\build\slave\win_upload_clang\build\src\third_party\llvm\lib\MC\MCCodeView.cpp, line 531
Wrote crash dump file "C:\Users\CHROME~2\AppData\Local\Temp\goma_temp.5068\clang-cl.exe-563144.dmp"

Let's leave it out for now.

Original issue's description:
> Reland of [wasm] Enforce that function bodies end with the \"end\" opcode. (patchset #1 id:1 of https://codereview.chromium.org/2628883006/ )
>
> Reason for revert:
> Try a reland; this might not have been the source of tree-closing.
>
> Original issue's description:
> > Revert of [wasm] Enforce that function bodies end with the \"end\" opcode. (patchset #3 id:40001 of https://codereview.chromium.org/2630553002/ )
> >
> > Reason for revert:
> > Caused tree to close by failing compilation:
> >
> > https://build.chromium.org/p/client.v8/builders/V8%20Win64%20-%20clang/builds/4451
> >
> > Original issue's description:
> > > [wasm] Enforce that function bodies end with the \"end\" opcode.
> > >
> > > R=rossberg@chromium.org
> > > BUG=chromium:575167
> > >
> > > Review-Url: https://codereview.chromium.org/2630553002
> > > Cr-Commit-Position: refs/heads/master@{#42286}
> > > Committed: fcc6e85ec6
> >
> > TBR=mtrofin@chromium.org,rossberg@chromium.org,jbroman@chromium.org,titzer@chromium.org
> > # Skipping CQ checks because original CL landed less than 1 days ago.
> > NOPRESUBMIT=true
> > NOTREECHECKS=true
> > NOTRY=true
> > BUG=chromium:575167
> >
> > Review-Url: https://codereview.chromium.org/2628883006
> > Cr-Commit-Position: refs/heads/master@{#42287}
> > Committed: 1d32a3989b
>
> TBR=mtrofin@chromium.org,rossberg@chromium.org,jbroman@chromium.org,titzer@chromium.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=chromium:575167
>
> Review-Url: https://codereview.chromium.org/2628203003
> Cr-Commit-Position: refs/heads/master@{#42296}
> Committed: e539bd8e0e

TBR=mtrofin@chromium.org,rossberg@chromium.org,jbroman@chromium.org,titzer@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:575167

Review-Url: https://codereview.chromium.org/2633583002
Cr-Commit-Position: refs/heads/master@{#42298}
2017-01-12 23:12:12 +00:00
littledan
e539bd8e0e Reland of [wasm] Enforce that function bodies end with the \"end\" opcode. (patchset #1 id:1 of https://codereview.chromium.org/2628883006/ )
Reason for revert:
Try a reland; this might not have been the source of tree-closing.

Original issue's description:
> Revert of [wasm] Enforce that function bodies end with the \"end\" opcode. (patchset #3 id:40001 of https://codereview.chromium.org/2630553002/ )
>
> Reason for revert:
> Caused tree to close by failing compilation:
>
> https://build.chromium.org/p/client.v8/builders/V8%20Win64%20-%20clang/builds/4451
>
> Original issue's description:
> > [wasm] Enforce that function bodies end with the \"end\" opcode.
> >
> > R=rossberg@chromium.org
> > BUG=chromium:575167
> >
> > Review-Url: https://codereview.chromium.org/2630553002
> > Cr-Commit-Position: refs/heads/master@{#42286}
> > Committed: fcc6e85ec6
>
> TBR=mtrofin@chromium.org,rossberg@chromium.org,jbroman@chromium.org,titzer@chromium.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=chromium:575167
>
> Review-Url: https://codereview.chromium.org/2628883006
> Cr-Commit-Position: refs/heads/master@{#42287}
> Committed: 1d32a3989b

TBR=mtrofin@chromium.org,rossberg@chromium.org,jbroman@chromium.org,titzer@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:575167

Review-Url: https://codereview.chromium.org/2628203003
Cr-Commit-Position: refs/heads/master@{#42296}
2017-01-12 22:27:38 +00:00
littledan
1d32a3989b Revert of [wasm] Enforce that function bodies end with the \"end\" opcode. (patchset #3 id:40001 of https://codereview.chromium.org/2630553002/ )
Reason for revert:
Caused tree to close by failing compilation:

https://build.chromium.org/p/client.v8/builders/V8%20Win64%20-%20clang/builds/4451

Original issue's description:
> [wasm] Enforce that function bodies end with the \"end\" opcode.
>
> R=rossberg@chromium.org
> BUG=chromium:575167
>
> Review-Url: https://codereview.chromium.org/2630553002
> Cr-Commit-Position: refs/heads/master@{#42286}
> Committed: fcc6e85ec6

TBR=mtrofin@chromium.org,rossberg@chromium.org,jbroman@chromium.org,titzer@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:575167

Review-Url: https://codereview.chromium.org/2628883006
Cr-Commit-Position: refs/heads/master@{#42287}
2017-01-12 20:01:06 +00:00
titzer
fcc6e85ec6 [wasm] Enforce that function bodies end with the \"end\" opcode.
R=rossberg@chromium.org
BUG=chromium:575167

Review-Url: https://codereview.chromium.org/2630553002
Cr-Commit-Position: refs/heads/master@{#42286}
2017-01-12 19:46:25 +00:00
titzer
6e8338865a [wasm] Implement correct 2-level namespace for imports.
R=clemensh@chromium.org
CC=rossberg@chromium.org
BUG=chromium:575167

Review-Url: https://codereview.chromium.org/2591753002
Cr-Commit-Position: refs/heads/master@{#41866}
2016-12-20 15:32:56 +00:00
rossberg
e2563e947f Test that table object indexing does not interfere with backing table
BUG=
R=ahaas@chromium.or

Review-Url: https://codereview.chromium.org/2502383003
Cr-Commit-Position: refs/heads/master@{#41074}
2016-11-17 12:55:45 +00:00
rossberg
4a90e7220c [wasm] Implement Table#set and Table#grow
R=ahaas@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2414053002
Cr-Commit-Position: refs/heads/master@{#40357}
2016-10-17 11:39:34 +00:00
rossberg
fb5b2f5241 [wasm] Implement {Compile,Runtime}Error; fix traps from start function
R=ahaas@chromium.org, titzer@chromium.org
BUG=v8:5507

Review-Url: https://codereview.chromium.org/2421453002
Cr-Commit-Position: refs/heads/master@{#40280}
2016-10-13 16:18:10 +00:00
rossberg
d95b754319 Implement Table#length and Table#get
R=ahaas@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2411963003
Cr-Commit-Position: refs/heads/master@{#40273}
2016-10-13 14:43:46 +00:00
ahaas
7bffaaac2c [wasm] Do a proper HasProperty() check in the memory and table setup.
The WebAssembly spec requires a HasProperty() check for the maximum
property of the descriptor object which is used to set up a
WebAssembly.Memory object or a WebAssembly.Table object.

The original implementation only approximated the HasProperty() check.
It used Get() to get the value of the maximum property of the descriptor
object and compared the resulting value to {undefined}. However, this
approximation is incorrect if the property exists but its value is
{undefined}.

R=titzer@chromium.org, franzih@chromium.org
BUG=chromium:649461
TEST=mjsunit/wasm/memory

Review-Url: https://codereview.chromium.org/2367673003
Cr-Commit-Position: refs/heads/master@{#39722}
2016-09-26 13:08:01 +00:00
ahaas
10d7ad9d94 [wasm] Bound the table size by Smi::kMaxValue.
BUG=chromium:649283
R=titzer@chromium.org
TEST=mjsunit/wasm/table

Review-Url: https://codereview.chromium.org/2358923003
Cr-Commit-Position: refs/heads/master@{#39711}
2016-09-26 10:15:15 +00:00
ahaas
698bbe418a [wasm] Set up Table and Memory constructors
Set up Wasm Table and Memory constructors

This only provides skeletons so far: the constructors work, but the
types are not wired up with the import/export mechanism yet; methods are
still nops.

Also, fix errors generated from Wasm to be proper Error/TypeError
instances instead of just strings.

I took over this CL from rossberg@chromium.org. The original CL is
https://codereview.chromium.org/2342623002

R=titzer@chromium.org, rossberg@chromium.org

Review-Url: https://codereview.chromium.org/2350643003
Cr-Commit-Position: refs/heads/master@{#39588}
2016-09-21 10:40:32 +00:00