Add MojoVideoDecoder.

media/media_options.gni

 # 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.
 
 import("//build/config/chromecast_build.gni")
 import("//build/config/features.gni")
 import("//build/config/headless_build.gni")
 
 declare_args() {
   # Allows distributions to link pulseaudio directly (DT_NEEDED) instead of
@@ skipping 67 matching lines @@
   # for testing only and will override the default platform MojoMediaClient.
   enable_test_mojo_media_client = false
 }
 
 # Use a second declare_args() to pick up possible overrides of enable_mojo_media
 # from --args command line flags. See "gn help declare_args".
 declare_args() {
   # A list of mojo media services that should be used in the media pipeline.
   # Must not be empty if |enable_mojo_media| is true.
   # Valid entries in the list are:
-  # - "renderer": Use mojo based media Renderer service.
-  # - "cdm": Use mojo based Content Decryption Module.
-  # - "audio_decoder": Use mojo based audio decoder in the default media
+  # - "renderer": Use mojo-based media Renderer service.
+  # - "cdm": Use mojo-based Content Decryption Module.
+  # - "audio_decoder": Use mojo-based audio decoder in the default media
   #                    Renderer. Cannot be used with the mojo Renderer above.
-  # TODO(xhwang): Support mojo base video decoders here.
-  # See http://crbug.com/542910 and http://crbug.com/522298
+  # - "video_decoder": Use mojo-based video decoder in the default media
+  #                    Renderer. Cannot be used with the mojo Renderer above.
   mojo_media_services = []
 
   # The process to host the mojo media application.
   # Valid options are:
   # - "none": Do not use mojo media application.
   # - "browser": Use mojo media application hosted in the browser process.
   # - "gpu": Use mojo media application hosted in the gpu process.
   # - "utility": Use mojo media application hosted in the utility process.
   mojo_media_host = "none"
 
@@ skipping 12 matching lines @@
         "cdm",
         "renderer",
       ]
       mojo_media_host = "browser"
     } else {
       mojo_media_services = [ "cdm" ]
       mojo_media_host = "utility"
     }
   }
 }