Mojify demuxers and allow running {Chunk/FFmpeg}Demuxer in a Utility Process

media/mojo/interfaces/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.
 
 import("//mojo/public/tools/bindings/mojom.gni")
 
 mojom("interfaces") {
   sources = [
     "audio_decoder.mojom",
     "audio_output.mojom",
     "audio_parameters.mojom",
     "audio_renderer_sink.mojom",
     "content_decryption_module.mojom",
+    "data_source.mojom",
     "decryptor.mojom",
+    "demuxer.mojom",
     "demuxer_stream.mojom",
     "interface_factory.mojom",
     "media_service.mojom",
     "media_types.mojom",
     "output_device_info.mojom",
     "output_protection.mojom",
     "provision_fetcher.mojom",
     "renderer.mojom",
+    "source_buffer.mojom",
     "video_decoder.mojom",
     "video_renderer_sink.mojom",
   ]
 
   if (is_chromeos) {
     sources += [ "platform_verification.mojom" ]
   }
 
   public_deps = [
     "//mojo/common:common_custom_types",
     "//services/service_manager/public/interfaces",
     "//ui/gfx/geometry/mojo",
     "//url/mojo:url_mojom_gurl",
   ]
 }
 
 mojom("remoting") {
   sources = [
     "remoting.mojom",
   ]
 }