Setup gclient and presubmit file.

This CL adds the necessary files to use gclient and the depot_tools with
the SPIRV-Tools directory. This allows doing things like `git cl format`
to format code pre-upload and `git cl presubmit -uf` to run presubmit
checks over the code.

The dependencies are all added to the DEPS file and will be
auto-downloaded. They are all pin'd to specific revisions so everyone
has the same checkout. Clang is included in the checkout so it will be
consistent over usages.

Use clang-format

.clang-format

@@ -2,4 +2,5 @@
 Language: Cpp
 BasedOnStyle: Google
 DerivePointerAlignment: false
+SortIncludes: true
 ...

.gitignore

@@ -1,13 +1,15 @@
-/build*
+.clang_complete
 .ycm_extra_conf.py*
 compile_commands.json
+/build*
 /external/googletest
 /external/SPIRV-Headers
 /external/spirv-headers
 /external/effcee
 /external/re2
 /TAGS
-/.clang_complete
+/third_party/llvm-build/
+/tools/clang/
 /utils/clang-format-diff.py
 
 # Vim

CMakeLists.txt

@@ -71,7 +71,7 @@ if(("${CMAKE_CXX_COMPILER_ID}" MATCHES "GNU") OR ("${CMAKE_CXX_COMPILER_ID}" MAT
   set(COMPILER_IS_LIKE_GNU TRUE)
 endif()
 if(${COMPILER_IS_LIKE_GNU})
-  set(SPIRV_WARNINGS -Wall -Wextra -Wnon-virtual-dtor -Wno-missing-field-initializers)
+  set(SPIRV_WARNINGS -Wall -Wextra -Wnon-virtual-dtor -Wno-missing-field-initializers -Wno-self-assign)
 
   option(SPIRV_WARN_EVERYTHING "Enable -Weverything" ${SPIRV_WARN_EVERYTHING})
   if(${SPIRV_WARN_EVERYTHING})

DEPS

@@ -0,0 +1,85 @@
+use_relative_paths = True
+
+vars = {
+  'chromium_git': 'https://chromium.googlesource.com',
+  'github': 'https://github.com',
+
+  'buildtools_revision': 'ab7b6a7b350dd15804c87c20ce78982811fdd76f',
+  'clang_revision': 'abe5e4f9dc0f1df848c7a0efa05256253e77a7b7',
+  'effcee_revision': '04b624799f5a9dbaf3fa1dbed2ba9dce2fc8dcf2',
+  'googletest_revision': '98a0d007d7092b72eea0e501bb9ad17908a1a036',
+  're2_revision': '6cf8ccd82dbaab2668e9b13596c68183c9ecd13f',
+  'spirv_headers_revision': '3ce3e49d73b8abbf2ffe33f829f941fb2a40f552',
+}
+
+deps = {
+  'buildtools':
+      Var('chromium_git') + '/chromium/buildtools.git@' +
+          Var('buildtools_revision'),
+
+  'external/spirv-headers':
+      Var('github') +  '/KhronosGroup/SPIRV-Headers.git@' +
+          Var('spirv_headers_revision'),
+
+  'external/googletest':
+      Var('github') + '/google/googletest.git@' + Var('googletest_revision'),
+
+  'external/effcee':
+      Var('github') + '/google/effcee.git@' + Var('effcee_revision'),
+
+  'external/re2':
+      Var('github') + '/google/re2.git@' + Var('re2_revision'),
+
+  'tools/clang':
+      Var('chromium_git') + '/chromium/src/tools/clang@' + Var('clang_revision')
+}
+
+recursedeps = [
+  # buildtools provides clang_format, libc++, and libc++api
+  'buildtools',
+]
+
+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', 'SPIRV-Tools/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', 'SPIRV-Tools/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', 'SPIRV-Tools/buildtools/linux64/clang-format.sha1',
+    ],
+  },
+  {
+    # Pull clang
+    'name': 'clang',
+    'pattern': '.',
+    'action': ['python',
+               'SPIRV-Tools/tools/clang/scripts/update.py'
+    ],
+  },
+]

PRESUBMIT.py

@@ -0,0 +1,49 @@
+# Copyright (c) 2018 The Khronos Group Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Presubmit script for SPIRV-Tools.
+
+See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts
+for more details about the presubmit API built into depot_tools.
+"""
+
+LINT_FILTERS = [
+  "-build/include",
+  "-build/include_order",
+  "-build/include_what_you_use",
+  "-build/namespaces",
+  "-readability/braces",
+  "-readability/casting",
+  "-readability/fn_size",
+  "-readability/todo",
+  "-runtime/explicit",
+  "-runtime/references",
+  "-whitespace/blank_line",
+  "-whitespace/ending_newline",
+  "-whitespace/line_length",
+  "-whitespace/newline",
+  "-whitespace/operators",
+  "-whitespace/parens",
+  "-whitespace/semicolon",
+  "-whitespace/todo"
+]
+
+
+def CheckChangeOnUpload(input_api, output_api):
+  results = []
+  results += input_api.canned_checks.CheckPatchFormatted(input_api, output_api)
+  results += input_api.canned_checks.CheckChangeLintsClean(
+      input_api, output_api, None, LINT_FILTERS)
+
+  return results

codereview.settings

@@ -0,0 +1,2 @@
+# This file is used by git cl to get repository specific information.
+CODE_REVIEW_SERVER: github.com