This adds in the GYP files needed for our GYP build.

build/common.gypi

Index: build/common.gypi
===================================================================
--- build/common.gypi	(revision 0)
+++ build/common.gypi	(revision 0)
@@ -0,0 +1,80 @@
+# Copyright (c) 2009 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+{
+  'includes': [
+    '../../build/common.gypi',
+  ],
+  'variables': {
+    'antlrdir': 'third_party/antlr3',
+    'breakpaddir': 'breakpad/src',
+    'fcolladadir': 'third_party/fcollada/files',
+    'gtestdir': 'testing/gtest/include',
+    'jpegdir': 'third_party/libjpeg',
+    'nacldir': 'third_party/native_client/googleclient',
+    'nixysadir': 'third_party/nixysa/files',
+    'npapidir': 'third_party/npapi/files',
+    'pngdir': 'third_party/libpng',
+    'skiadir': 'third_party/skia/include',
+    'zlibdir': 'third_party/zlib',
+  },
+  'conditions' : [
+    ['OS == "win"',
+      {
+        'variables': {
+          'renderer': 'd3d9',
+          'cgdir': 'third_party/cg/files/win',
+          'LIBRARY_SUFFIX': '.lib',
+          'CONFIGURATION': '$(ConfigurationName)',
+        },
+        'target_defaults': {
+          'defines': [
+            '_CRT_SECURE_NO_WARNINGS',
+            'RENDERER_D3D9',
+            'OS_WIN',
+            'NACL_WINDOWS',
+          ],
+          'msvs_disabled_warnings': [4355],
+          'msvs_settings': {
+            'VCCLCompilerTool': {
+              'AdditionalOptions': '/MP',
+            },
+          },
+        },
+      },
+    ],
+    ['OS == "mac"',
+      {
+        'variables': {
+          'renderer': 'gl',
+          'cgdir': 'third_party/cg/files/mac',
+          'LIBRARY_SUFFIX': '.a',
+          'CONFIGURATION': '$(CONFIGURATION)',
+        },
+        'target_defaults': {
+          'defines': [
+            'RENDERER_GL',
+            'OS_MACOSX',
+          ],
+        },
+      },
+    ],
+    ['OS == "linux"',
+      {
+        'variables': {
+          'renderer': 'gl',
+          'cgdir': 'third_party/cg/files/linux',
+          'LIBRARY_SUFFIX': '.a',
+          'CONFIGURATION': '$(CONFIGURATION)',
+        },
+        'target_defaults': {
+          'defines': [
+            'RENDERER_GL',
+            'OS_LINUX',
+          ],
+        },
+      },
+    ],
+  ],
+}