Add the mp2t mimetype to the list of supported mime types.

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 2571 matching lines @@
         'defines': ['ENABLE_PROFILING=1'],
       }],
       ['remoting==1', {
         'defines': ['ENABLE_REMOTING=1'],
       }],
       ['enable_webrtc==1', {
         'defines': ['ENABLE_WEBRTC=1'],
       }],
       ['proprietary_codecs==1', {
         'defines': ['USE_PROPRIETARY_CODECS'],
+        'conditions': [
+          ['enable_mpeg2ts_stream_parser==1', {
+            'defines': ['ENABLE_MPEG2TS_STREAM_PARSER'],
+          }],
+        ],
       }],
       ['enable_viewport==1', {
         'defines': ['ENABLE_VIEWPORT'],
       }],
       ['enable_pepper_cdms==1', {
         'defines': ['ENABLE_PEPPER_CDMS'],
       }],
       ['enable_browser_cdms==1', {
         'defines': ['ENABLE_BROWSER_CDMS'],
       }],
@@ skipping 3102 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',
   },
 }