Use FFmpegVideoDecoder from a UtilityProcess

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("//testing/libfuzzer/fuzzer_test.gni")
 
 declare_args() {
   # Allows distributions to link pulseaudio directly (DT_NEEDED) instead of
@@ skipping 56 matching lines @@
       use_pulseaudio = true
     }
   }
 }
 
 declare_args() {
   # Experiment to enable mojo media services (e.g. "renderer", "cdm", see
   # |mojo_media_services|). When enabled, selected mojo paths will be enabled in
   # the media pipeline and corresponding services will hosted in the selected
   # remote process (e.g. "utility" process, see |mojo_media_host|).
-  enable_mojo_media = is_android || is_chromecast
+  enable_mojo_media = is_android || is_chromecast || is_desktop_linux
 
   # Enable the TestMojoMediaClient to be used in mojo MediaService. This is for
   # testing only and will override the default platform MojoMediaClient, if any.
   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.
@@ skipping 24 matching lines @@
         "cdm",
         "audio_decoder",
       ]
       mojo_media_host = "gpu"
     } else if (is_chromecast) {
       mojo_media_services = [
         "cdm",
         "renderer",
       ]
       mojo_media_host = "browser"
+    } else if (is_desktop_linux) {

[sandersd (OOO until July 31), 2016/12/15 00:38:02]

|is_desktop_linux| seems to be defined as |current_os == "linux"|. Does that
exclude chromecast?

If not, there should be a comment or condition here to make it clear that the
order of the conditions matters.

+      mojo_media_services = [ "video_decoder" ]
+      mojo_media_host = "utility"
     } else {
       mojo_media_services = [ "video_decoder" ]

[sandersd (OOO until July 31), 2016/12/15 00:38:02]

Do you plan to expand past desktop linux eventually? If so we have a problem
here, since this is the path that VDAs (DXVA, VTVDA, and the CrOS VDAs) will be
using soon.

       mojo_media_host = "gpu"
     }
   }
 }
 
 declare_args() {
   # This switch defines whether the Media Remoting implementation will be built.
   # When enabled, media is allowed to be renderer and played back on remote
   # devices when the tab is being casted and other conditions are met.
   enable_media_remoting = !is_chromecast && !is_ios && !is_android
 }