Add support for external video renderers in mojo.

media/mojo/services/BUILD.gn

 # 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.
 
 # Things needed by multiple targets, like renderer_impl and renderer_app.
 # GYP version: media/media.gyp:media_mojo_lib
 source_set("lib") {
   deps = [
     "//base",
     "//media",
     "//media/mojo/interfaces",
     "//mojo/common",
+    "//mojo/converters/geometry",
     "//mojo/environment:chromium",
     "//mojo/public/c/system:for_component",
+    "//skia",
   ]
 
   sources = [
     "media_type_converters.cc",
     "media_type_converters.h",
     "mojo_demuxer_stream_adapter.cc",
     "mojo_demuxer_stream_adapter.h",
   ]
 }
 
@@ skipping 96 matching lines @@
   ]
 }
 
 group("tests") {
   testonly = true
   deps = [
     ":mojo_media_lib_unittests",
     ":renderer_apptest",
   ]
 }