RenderWidgetCompositor should be decoupled from RenderWidget.

content/content_renderer.gypi

 # Copyright (c) 2012 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.
 
 {
   'dependencies': [
     '../base/base.gyp:base',
     '../base/third_party/dynamic_annotations/dynamic_annotations.gyp:dynamic_annotations',
     '../cc/cc.gyp:cc',
     '../cc/cc.gyp:cc_proto',
@@ skipping 197 matching lines @@
       'renderer/gpu/frame_swap_message_queue.cc',
       'renderer/gpu/frame_swap_message_queue.h',
       'renderer/gpu/gpu_benchmarking_extension.cc',
       'renderer/gpu/gpu_benchmarking_extension.h',
       'renderer/gpu/mailbox_output_surface.cc',
       'renderer/gpu/mailbox_output_surface.h',
       'renderer/gpu/queue_message_swap_promise.cc',
       'renderer/gpu/queue_message_swap_promise.h',
       'renderer/gpu/render_widget_compositor.cc',
       'renderer/gpu/render_widget_compositor.h',
+      'renderer/gpu/render_widget_compositor_delegate.h',
       'renderer/gpu/stream_texture_host_android.cc',
       'renderer/gpu/stream_texture_host_android.h',
       'renderer/history_controller.cc',
       'renderer/history_controller.h',
       'renderer/history_entry.cc',
       'renderer/history_entry.h',
       'renderer/history_serialization.cc',
       'renderer/history_serialization.h',
       'renderer/idle_user_detector.cc',
       'renderer/idle_user_detector.h',
@@ skipping 693 matching lines @@
     }],
   ],
   'target_conditions': [
     ['OS=="android"', {
       'sources/': [
         ['include', '^renderer/render_view_linux\\.cc$'],
       ],
     }],
   ],
 }