Add clang-format integration for 'git cl format'.

.clang-format

+# Defines the ANGLE style for automatic reformatting.
+# https://code.google.com/p/angleproject/wiki/CodingStandard
+# See Clang docs: http://clang.llvm.org/docs/ClangFormatStyleOptions.html
+BasedOnStyle: Chromium
+
+# Allow double brackets such as std::vector<std::vector<int>>.
+Standard: Cpp11
+
+# Indent 4 spaces at a time.
+IndentWidth: 4
+
+# Keep lines under 100 columns long.
+ColumnLimit: 100
+
+# Always break before braces
+BreakBeforeBraces: Allman
+
+# Indent case labels.
+IndentCaseLabels: true
+
+# Right-align pointers and references
+PointerAlignment: Right
+
+# ANGLE likes to align things as much as possible.
+AlignOperands: true
+AlignConsecutiveAssignments: true
+
+# Use 2 space negative offset for access modifiers
+AccessModifierOffset: -2
+
+# TODO(jmadill): Decide if we want this on. Doesn't have an "all or none" mode.
+AllowShortCaseLabelsOnASingleLine: false

.gitignore

@@ -39,3 +39,4 @@ TestResults.qpa
 *.psess
 *.vsp
 *.nvuser
+buildtools/

DEPS

+vars = {
+  'chromium_git': 'https://chromium.googlesource.com',
+}
+
 deps = {
   "third_party/gyp":
-      "http://chromium.googlesource.com/external/gyp@b4781fc38236b0fb1238969c918a75a200cfffdb",
+      Var('chromium_git') + "/external/gyp@b4781fc38236b0fb1238969c918a75a200cfffdb",
 
   # TODO(kbr): figure out how to better stay in sync with Chromium's
   # versions of googletest and googlemock.
   "src/tests/third_party/googletest":
-      "http://chromium.googlesource.com/external/googletest.git@23574bf2333f834ff665f894c97bef8a5b33a0a9",
+      Var('chromium_git') + "/external/googletest.git@23574bf2333f834ff665f894c97bef8a5b33a0a9",
 
   "src/tests/third_party/googlemock":
-      "http://chromium.googlesource.com/external/googlemock.git@b2cb211e49d872101d991201362d7b97d7d69910",
+      Var('chromium_git') + "/external/googlemock.git@b2cb211e49d872101d991201362d7b97d7d69910",
 
   "third_party/deqp/src":
       "https://android.googlesource.com/platform/external/deqp@92f7752da82925ca5e7288c5b4814efa7a381d89",
@@ -17,10 +21,47 @@ deps = {
       "https://android.googlesource.com/platform/external/libpng@094e181e79a3d6c23fd005679025058b7df1ad6c",
 
   "third_party/zlib":
-      "https://chromium.googlesource.com/chromium/src/third_party/zlib@afd8c4593c010c045902f6c0501718f1823064a3",
+      Var('chromium_git') + "/chromium/src/third_party/zlib@afd8c4593c010c045902f6c0501718f1823064a3",
+
+  "buildtools":
+      Var('chromium_git') + '/chromium/buildtools.git@125d157607de4d7c95bf8b02dd580aae17962f19',
 }
 
 hooks = [
+  # Pull clang-format binaries using checked-in hashes.
+  {
+    'name': 'clang_format_win',
+    'pattern': '.',
+    'action': [ 'download_from_google_storage',
+                '--no_resume',
+                '--platform=win32',
+                '--no_auth',
+                '--bucket', 'chromium-clang-format',
+                '-s', 'buildtools/win/clang-format.exe.sha1',
+    ],
+  },
+  {
+    'name': 'clang_format_mac',
+    'pattern': '.',
+    'action': [ 'download_from_google_storage',
+                '--no_resume',
+                '--platform=darwin',
+                '--no_auth',
+                '--bucket', 'chromium-clang-format',
+                '-s', 'buildtools/mac/clang-format.sha1',
+    ],
+  },
+  {
+    'name': 'clang_format_linux',
+    'pattern': '.',
+    'action': [ 'download_from_google_storage',
+                '--no_resume',
+                '--platform=linux*',
+                '--no_auth',
+                '--bucket', 'chromium-clang-format',
+                '-s', 'buildtools/linux64/clang-format.sha1',
+    ],
+  },
   {
     # A change to a .gyp, .gypi, or to GYP itself should run the generator.
     "pattern": ".",