Added #ifdef to allow Chromium to enable proprietary codecs.

build/common.gypi

 # Copyright (c) 2010 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': {
     # .gyp files or targets should set chromium_code to 1 if they build
@@ skipping 171 matching lines @@
     # static_library and shared_library. We default to doing a static build
     # but you can override this with "gyp -Dlibrary=shared_library" or you
     # can add the following line (without the #) to ~/.gyp/include.gypi
     # {'variables': {'library': 'shared_library'}}
     # to compile as shared by default
     'library%': 'static_library',
 
     # Whether usage of OpenMAX is enabled.
     'enable_openmax%': 0,
 
+    # Whether proprietary audio/video codecs are assumed to be included with
+    # this build (only meaningful if branding!=Chrome).
+    'proprietary_codecs%': 0,
+
     # TODO(bradnelson): eliminate this when possible.
     # To allow local gyp files to prevent release.vsprops from being included.
     # Yes(1) means include release.vsprops.
     # Once all vsprops settings are migrated into gyp, this can go away.
     'msvs_use_common_release%': 1,
 
     # TODO(bradnelson): eliminate this when possible.
     # To allow local gyp files to override additional linker options for msvs.
     # Yes(1) means set use the common linker options.
     'msvs_use_common_linker_extras%': 1,
@@ skipping 191 matching lines @@
         'defines': ['GOOGLE_CHROME_BUILD'],
       }, {  # else: branding!="Chrome"
         'defines': ['CHROMIUM_BUILD'],
       }],
       ['toolkit_views==1', {
         'defines': ['TOOLKIT_VIEWS=1'],
       }],
       ['chromeos==1', {
         'defines': ['OS_CHROMEOS=1'],
       }],
+      ['proprietary_codecs==1', {
+        'defines': ['USE_PROPRIETARY_CODECS'],
+      }],
       ['fastbuild!=0', {
         'conditions': [
           # Finally, for Windows, we simply turn on profiling.
           ['OS=="win"', {
             'msvs_settings': {
               'VCLinkerTool': {
                 'GenerateDebugInformation': 'false',
               },
               'VCCLCompilerTool': {
                 'DebugInformationFormat': '0',
@@ skipping 930 matching lines @@
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }
 
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