Re-land extract state management from WebMediaPlayerImpl.

media/blink/media_blink.gyp

 # Copyright 2014 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.
 
 {
   'includes': [
     '../media_variables.gypi'
   ],
   'targets': [
     {
@@ skipping 42 matching lines @@
         'lru.h',
         'media_blink_export.h',
         'multibuffer.cc',
         'multibuffer.h',
         'multibuffer_data_source.cc',
         'multibuffer_data_source.h',
         'multibuffer_reader.cc',
         'multibuffer_reader.h',
         'new_session_cdm_result_promise.cc',
         'new_session_cdm_result_promise.h',
+        'pipeline_state.cc',
+        'pipeline_state.h',
         'resource_multibuffer_data_provider.cc',
         'resource_multibuffer_data_provider.h',
         'texttrack_impl.cc',
         'texttrack_impl.h',
         'url_index.cc',
         'url_index.h',
         'video_frame_compositor.cc',
         'video_frame_compositor.h',
         'webaudiosourceprovider_impl.cc',
         'webaudiosourceprovider_impl.h',
@@ skipping 105 matching lines @@
                   '../../tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
                 ],
               }
             ],
           ],
         },
       ],
     }],
   ],
 }