Media Remoting: Add RemotingController.

content/renderer/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("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//media/media_options.gni")
 import("//third_party/webrtc/build/webrtc.gni")
 import("//tools/ipc_fuzzer/ipc_fuzzer.gni")
 
@@ skipping 491 matching lines @@
       "java/gin_java_bridge_dispatcher.h",
       "java/gin_java_bridge_object.cc",
       "java/gin_java_bridge_object.h",
       "java/gin_java_bridge_value_converter.cc",
       "java/gin_java_bridge_value_converter.h",
       "java/gin_java_function_invocation_helper.cc",
       "java/gin_java_function_invocation_helper.h",
     ]
   }
 
+  if (enable_media_remoting) {
+    deps += [ "//media/remoting" ]
+
+    defines += [ "ENABLE_MEDIA_REMOTING" ]

[xhwang, 2016/10/05 05:27:53]

This is the old way. For new code, please use BUILDFLAG:

https://cs.chromium.org/chromium/src/build/buildflag_header.gni?sq=package:ch...

Also, is it possible that you'll need to check this build flag in the browser
side as well (e.g. content/browser)? Since enable_media_remoting is declared in
media/, usually we define the buildflag in media/ as well. See this example:

https://cs.chromium.org/chromium/src/media/BUILD.gn?rcl=0&l=16

[xjz, 2016/10/05 17:24:23]

Done.

+  }
+
   if (enable_webrtc) {
     # WebRTC plugin-related stuff goes in a different section below.
     sources += [
       "media/aec_dump_message_filter.cc",
       "media/aec_dump_message_filter.h",
       "media/audio_repetition_detector.cc",
       "media/audio_repetition_detector.h",
       "media/audio_track_recorder.cc",
       "media/audio_track_recorder.h",
       "media/canvas_capture_handler.cc",
@@ skipping 381 matching lines @@
     # For the defines in mojo_media_config.
     public_configs = [ "//media/mojo/services:mojo_media_config" ]
   }
 
   if (!is_component_build) {
     public_deps = [
       ":renderer",
     ]
   }
 }