Media Session API: use MediaMetadata in the browser process.

content/content_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.
 
 {
   'dependencies': [
     '../base/base.gyp:base',
     '../cc/cc.gyp:cc',
     '../components/tracing.gyp:tracing',
     '../device/bluetooth/bluetooth.gyp:device_bluetooth',
@@ skipping 216 matching lines @@
       'common/android/address_parser_internal.cc',
       'common/android/address_parser_internal.h',
       'common/android/common_jni_registrar.cc',
       'common/android/common_jni_registrar.h',
       'common/android/gin_java_bridge_errors.cc',
       'common/android/gin_java_bridge_errors.h',
       'common/android/gin_java_bridge_value.cc',
       'common/android/gin_java_bridge_value.h',
       'common/android/hash_set.cc',
       'common/android/hash_set.h',
+      'common/android/media_metadata_android.cc',
+      'common/android/media_metadata_android.h',
       'common/android/sync_compositor_messages.cc',
       'common/android/sync_compositor_messages.h',
       'common/appcache_interfaces.cc',
       'common/appcache_interfaces.h',
       'common/appcache_messages.h',
       'common/ax_content_node_data.cc',
       'common/ax_content_node_data.h',
       'common/bluetooth/bluetooth_device.cc',
       'common/bluetooth/bluetooth_device.h',
       'common/bluetooth/bluetooth_messages.h',
@@ skipping 862 matching lines @@
         'common/gpu/client/gpu_memory_buffer_impl_ozone.cc',
         'common/gpu/client/gpu_memory_buffer_impl_ozone_native_pixmap.cc',
         'common/gpu/client/gpu_memory_buffer_impl_ozone_native_pixmap.h',
         'common/gpu/gpu_memory_buffer_factory_ozone.cc',
         'common/gpu/gpu_memory_buffer_factory_ozone_native_pixmap.cc',
         'common/gpu/gpu_memory_buffer_factory_ozone_native_pixmap.h',
       ],
     }],
   ],
 }