Make it possible to switch between two different versions of ANGLE.

build/common.gypi

 # Copyright (c) 2012 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.
 
 # IMPORTANT:
 # Please don't directly include this file if you are building via gyp_chromium,
 # since gyp_chromium is automatically forcing its inclusion.
 {
   # Variables expected to be overriden on the GYP command line (-D) or by
   # ~/.gyp/include.gypi.
@@ skipping 1682 matching lines @@
       ['android_webview_build==1', {
         # The WebView build gets its cpu-specific flags from the Android build system.
         'arm_arch%': '',
         'arm_tune%': '',
         'arm_fpu%': '',
         'arm_float_abi%': '',
         'arm_thumb%': 0,
       }],
     ],
 
+
+    # The path to the ANGLE library. TODO(apatrick): This is to help
+    # transition to a new version of ANGLE at a new location. After the
+    # transition is complete, this can be removed.
+    'angle_path': '<(DEPTH)/third_party/angle',
+
     # List of default apps to install in new profiles.  The first list contains
     # the source files as found in svn.  The second list, used only for linux,
     # contains the destination location for each of the files.  When a crx
     # is added or removed from the list, the chrome/browser/resources/
     # default_apps/external_extensions.json file must also be updated.
     'default_apps_list': [
       'browser/resources/default_apps/external_extensions.json',
       'browser/resources/default_apps/gmail.crx',
       'browser/resources/default_apps/search.crx',
       'browser/resources/default_apps/youtube.crx',
@@ skipping 91 matching lines @@
           # See http://gcc.gnu.org/onlinedocs/gcc-4.4.2/gcc/Optimize-Options.html
           'mac_release_optimization%': 's', # Use -Os unless overridden
           'mac_debug_optimization%': '0',   # Use -O0 unless overridden
         }, {
           # See http://gcc.gnu.org/onlinedocs/gcc-4.4.2/gcc/Optimize-Options.html
           'mac_release_optimization%': '3', # Use -O3 unless overridden
           'mac_debug_optimization%': '0',   # Use -O0 unless overridden
         }],
       ],
     },
+    'defines': [
+      # Set this to use the new DX11 version of ANGLE.
+      # TODO(apatrick): Remove this when the transition is complete.
+      #'ANGLE_DX11',
+    ],
     'conditions': [
       ['(OS=="mac" or OS=="ios") and asan==1', {
         'dependencies': [
           '<(DEPTH)/build/mac/asan.gyp:asan_dynamic_runtime',
         ],
       }],
       ['OS=="linux" and linux_use_tcmalloc==1 and clang_type_profiler==1', {
         'cflags_cc!': ['-fno-rtti'],
         'cflags_cc+': [
           '-frtti',
@@ skipping 2698 matching lines @@
     # settings in target dicts.  SYMROOT is a special case, because many other
     # Xcode variables depend on it, including variables such as
     # PROJECT_DERIVED_FILE_DIR.  When a source group corresponding to something
     # like PROJECT_DERIVED_FILE_DIR is added to a project, in order for the
     # files to appear (when present) in the UI as actual files and not red
     # red "missing file" proxies, the correct path to PROJECT_DERIVED_FILE_DIR,
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }