Documentation: Consistancy

* Don't rely on '#!', since it doesn't work for Windows cmd shell.
  * Consistantly use `tools/git-sync-deps` rather than `bin/sync`.
  * Always call `bin/gn` ranther than `gn` in case depot_tools is
    missing from the path.

NOTRY=true
Change-Id: I27909f2610d1bb3241874399d7d2f7286f99f43b
Reviewed-on: https://skia-review.googlesource.com/9640
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Mike Klein <mtklein@chromium.org>

site/dev/chrome/repo.md

@@ -3,10 +3,8 @@ Working in a Chromium repo
 
 To work on Skia inside a Chromium checkout, run the following:
 
-~~~~
-$ cd chromium/src/third_party/skia
-$ tools/git-sync-deps
-~~~~
+    cd chromium/src/third_party/skia
+    python tools/git-sync-deps
 
 This command does a minimal "just sync the DEPS" emulation of gclient sync for
 Skia into chromium/src/third_party/skia/third_party.  After that, make dm or

site/dev/contrib/submit.md

@@ -32,7 +32,7 @@ If your branch gets out of date, you will need to update it:
 <!--?prettify lang=sh?-->
 
     git pull
-    python bin/sync
+    python tools/git-sync-deps
 
 Adding a unit test
 ------------------

site/dev/testing/testing.md

@@ -6,8 +6,8 @@ This is a quickstart to building and running DM.
 
 <!--?prettify lang=sh?-->
 
-    python bin/sync
-    gn gen out/Debug
+    python tools/git-sync-deps
+    bin/gn gen out/Debug
     ninja -C out/Debug dm
     out/Debug/dm -v -w dm_output
 

site/dev/testing/tests.md

@@ -9,9 +9,9 @@ We assume you have already synced Skia's dependecies and set up Skia's build sys
 
 <!--?prettify lang=sh?-->
 
-    python bin/sync
-    gn gen out/Debug
-    gn gen out/Release --args='is_debug=false'
+    python tools/git-sync-deps
+    bin/gn gen out/Debug
+    bin/gn gen out/Release --args='is_debug=false'
 
 <span id="test"></span>
 

site/dev/testing/xsan.md

@@ -8,7 +8,7 @@ Get Clang binaries
 
     CLANGDIR="${HOME}/clang"
 
-    tools/git-sync-deps
+    python tools/git-sync-deps
     CC= CXX= infra/bots/assets/clang_linux/create.py -t "$CLANGDIR"
 
 Configure and Compile Skia with MSAN
@@ -23,7 +23,7 @@ Configure and Compile Skia with MSAN
         sanitize = "MSAN"
         skia_use_fontconfig = false
     EOF
-    tools/git-sync-deps
+    python tools/git-sync-deps
     bin/gn gen out/msan
     ninja -C out/msan
 
@@ -37,7 +37,7 @@ Configure and Compile Skia with ASAN
         cxx = "${CLANGDIR}/bin/clang++"
         sanitize = "ASAN"
     EOF
-    tools/git-sync-deps
+    python tools/git-sync-deps
     bin/gn gen out/asan
     ninja -C out/asan
 
@@ -52,7 +52,7 @@ Configure and Compile Skia with TSAN
         sanitize = "TSAN"
         is_debug = false
     EOF
-    tools/git-sync-deps
+    python tools/git-sync-deps
     bin/gn gen out/tsan
     ninja -C out/tsan
 

site/user/sample/viewer.md

@@ -17,7 +17,7 @@ Linux, Macintosh and Windows
 
 The Viewer can be built using the regular GN build process, e.g.
 
-    gn gen out/Release --args='is_debug=false'
+    bin/gn gen out/Release --args='is_debug=false'
     ninja -C out/Release viewer
 
 Android