Adds initial key systems support for Chromecast.

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 1806 matching lines @@
       }],  # OS=="android"
       ['embedded==1', {
         'use_system_fontconfig%': 0,
       }, {
         'use_system_fontconfig%': 1,
       }],
       ['chromecast==1', {
         'enable_mpeg2ts_stream_parser%': 1,
         'ffmpeg_branding%': 'Chrome',
         'ozone_platform_ozonex%': 1,
+        'use_playready%': 0,
         'conditions': [
           ['target_arch=="arm"', {
             'arm_arch%': '',
             'arm_tune%': 'cortex-a9',
             'arm_thumb%': 1,
             'video_hole%': 1,
           }],
         ],
       }],
       ['android_webview_build==1', {
@@ skipping 976 matching lines @@
         'conditions': [
           ['target_arch=="arm"', {
             'defines': [
               # TODO(lcwu): Work around an error when building Chromium
               # with gcc-4.5.3 (e.g. v8/src/platform-linux.cc). Remove
               # this define once the toolchain is updated.
               # See crbug.com/388933.
               '__SOFTFP',
             ],
           }],
+          ['use_playready==1', {
+            'defines': [
+              'PLAYREADY_CDM_AVAILABLE',
+            ],
+          }],
         ],
       }],
       ['enable_task_manager==1', {
         'defines': [
           'ENABLE_TASK_MANAGER=1',
         ],
       }],
       ['enable_extensions==1', {
         'defines': [
           'ENABLE_EXTENSIONS=1',
@@ skipping 2959 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',
   },
 }