Enable H.264 video WebRTC behind run-time flag and add WebRtcBrowserTest for H.264

content/content.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,  # Use higher warning level.
     'chromium_enable_vtune_jit_for_v8%': 0,  # enable the vtune support for V8 engine.
     'directxsdk_exists': '<!pymod_do_main(dir_exists ../third_party/directxsdk)',
   },
@@ skipping 19 matching lines @@
         '../third_party/webrtc/build/common.gypi',
       ],
       'conditions': [
         # This conditional looks insane, but without it |rtc_use_h264| is not
         # recognized as defined. Might have something to do with scopes. Moving
         # the inclusion of third_party/webrtc/build/common.gypi to outside of
         # 'targets' is not an option, then we get compile errors.
         # TODO(hbos): crbug.com/584219
         ['1==1', {
           'variables': {
-            'buildflag_header_path': 'content/renderer/renderer_features.h',
+            'buildflag_header_path': 'content/public/renderer/renderer_features.h',
             'buildflag_flags': [
               'RTC_USE_H264=<(rtc_use_h264)',
             ],
           },
         }],
       ],
     },
   ],
   'conditions': [
     ['OS != "ios"', {
@@ skipping 626 matching lines @@
           },
           'includes': [
             '../build/android/copy_ex.gypi',
             '../build/android/v8_external_startup_data_arch_suffix.gypi',
           ],
         },
       ],
     }],  # OS == "android"
   ],
 }