Add initial BUILD.gn files for libdawn[|_native|_wire]
diff --git a/DEPS b/DEPS
new file mode 100644
index 0000000..a0bd241
--- /dev/null
+++ b/DEPS
@@ -0,0 +1,154 @@
+vars = {
+  'chromium_git': 'https://chromium.googlesource.com',
+  'github_git': 'https://github.com',
+
+  'dawn_root': '.',
+  'dawn_standalone': True,
+}
+
+deps = {
+  # Dependencies required to use GN/Clang in standalone
+  '{dawn_root}/build': {
+    'url': '{chromium_git}/chromium/src/build.git@b944b99e72923c5a6699235ed858e725db21f81f',
+    'condition': 'dawn_standalone',
+  },
+  '{dawn_root}/buildtools': {
+    'url': '{chromium_git}/chromium/buildtools.git@94288c26d2ffe3aec9848c147839afee597acefd',
+    'condition': 'dawn_standalone',
+  },
+  '{dawn_root}/tools/clang': {
+    'url': '{chromium_git}/chromium/src/tools/clang.git@c893c7eec4706f8c7fc244ee254b1dadd8f8d158',
+    'condition': 'dawn_standalone',
+  },
+
+  # GTest and GMock
+  '{dawn_root}/testing': {
+    'url': '{chromium_git}/chromium/src/testing@4d706fd80be9e8989aec5235540e7b46d0672826',
+    'condition': 'dawn_standalone',
+  },
+
+  # SPIRV-Cross
+  '{dawn_root}/third_party/spirv-cross': {
+    'url': '{github_git}/Kangz/SPIRV-Cross.git@694cad533296df02b4562f4a5a20cba1d1a9dbaf',
+  },
+}
+
+hooks = [
+  # Pull clang-format binaries using checked-in hashes.
+  {
+    'name': 'clang_format_win',
+    'pattern': '.',
+    'condition': 'host_os == "win" and dawn_standalone',
+    'action': [ 'download_from_google_storage',
+                '--no_resume',
+                '--platform=win32',
+                '--no_auth',
+                '--bucket', 'chromium-clang-format',
+                '-s', '{dawn_root}/buildtools/win/clang-format.exe.sha1',
+    ],
+  },
+  {
+    'name': 'clang_format_mac',
+    'pattern': '.',
+    'condition': 'host_os == "mac" and dawn_standalone',
+    'action': [ 'download_from_google_storage',
+                '--no_resume',
+                '--platform=darwin',
+                '--no_auth',
+                '--bucket', 'chromium-clang-format',
+                '-s', '{dawn_root}/buildtools/mac/clang-format.sha1',
+    ],
+  },
+  {
+    'name': 'clang_format_linux',
+    'pattern': '.',
+    'condition': 'host_os == "linux" and dawn_standalone',
+    'action': [ 'download_from_google_storage',
+                '--no_resume',
+                '--platform=linux*',
+                '--no_auth',
+                '--bucket', 'chromium-clang-format',
+                '-s', '{dawn_root}/buildtools/linux64/clang-format.sha1',
+    ],
+  },
+
+  # Pull GN binaries using checked-in hashes.
+  {
+    'name': 'gn_win',
+    'pattern': '.',
+    'condition': 'host_os == "win" and dawn_standalone',
+    'action': [ 'download_from_google_storage',
+                '--no_resume',
+                '--platform=win32',
+                '--no_auth',
+                '--bucket', 'chromium-gn',
+                '-s', '{dawn_root}/buildtools/win/gn.exe.sha1',
+    ],
+  },
+  {
+    'name': 'gn_mac',
+    'pattern': '.',
+    'condition': 'host_os == "mac" and dawn_standalone',
+    'action': [ 'download_from_google_storage',
+                '--no_resume',
+                '--platform=darwin',
+                '--no_auth',
+                '--bucket', 'chromium-gn',
+                '-s', '{dawn_root}/buildtools/mac/gn.sha1',
+    ],
+  },
+  {
+    'name': 'gn_linux64',
+    'pattern': '.',
+    'condition': 'host_os == "linux" and dawn_standalone',
+    'action': [ 'download_from_google_storage',
+                '--no_resume',
+                '--platform=linux*',
+                '--no_auth',
+                '--bucket', 'chromium-gn',
+                '-s', '{dawn_root}/buildtools/linux64/gn.sha1',
+    ],
+  },
+
+  # Pull the compilers and system libraries for hermetic builds
+  {
+    'name': 'sysroot_x86',
+    'pattern': '.',
+    'condition': 'checkout_linux and ((checkout_x86 or checkout_x64) and dawn_standalone)',
+    'action': ['python', '{dawn_root}/build/linux/sysroot_scripts/install-sysroot.py',
+               '--arch=x86'],
+  },
+  {
+    'name': 'sysroot_x64',
+    'pattern': '.',
+    'condition': 'checkout_linux and (checkout_x64 and dawn_standalone)',
+    'action': ['python', '{dawn_root}/build/linux/sysroot_scripts/install-sysroot.py',
+               '--arch=x64'],
+  },
+  {
+    # Update the Windows toolchain if necessary.  Must run before 'clang' below.
+    'name': 'win_toolchain',
+    'pattern': '.',
+    'condition': 'checkout_win and dawn_standalone',
+    'action': ['python', '{dawn_root}/build/vs_toolchain.py', 'update', '--force'],
+  },
+  {
+    # Note: On Win, this should run after win_toolchain, as it may use it.
+    'name': 'clang',
+    'pattern': '.',
+    'action': ['python', '{dawn_root}/tools/clang/scripts/update.py'],
+    'condition': 'dawn_standalone',
+  },
+  {
+    # Pull rc binaries using checked-in hashes.
+    'name': 'rc_win',
+    'pattern': '.',
+    'condition': 'checkout_win and (host_os == "win" and dawn_standalone)',
+    'action': [ 'download_from_google_storage',
+                '--no_resume',
+                '--no_auth',
+                '--bucket', 'chromium-browser-clang/rc',
+                '-s', '{dawn_root}/build/toolchain/win/rc/win/rc.exe.sha1',
+    ],
+  },
+]