Make Reflector Use Main Thread MessageLoop when in SingleThread

content/browser/compositor/reflector_impl.cc

 // 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.
 
 #include "content/browser/compositor/reflector_impl.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "content/browser/compositor/browser_compositor_output_surface.h"
 #include "content/browser/compositor/owned_mailbox.h"
 #include "content/common/gpu/client/gl_helper.h"
 #include "ui/compositor/layer.h"
 
 namespace content {
 
 ReflectorImpl::ReflectorImpl(
     ui::Compositor* mirrored_compositor,
     ui::Layer* mirroring_layer,
     IDMap<BrowserCompositorOutputSurface>* output_surface_map,
     base::MessageLoopProxy* compositor_thread_loop,
     int surface_id)
     : impl_unsafe_(output_surface_map),
       main_unsafe_(mirrored_compositor, mirroring_layer),
-      impl_message_loop_(compositor_thread_loop),
       main_message_loop_(base::MessageLoopProxy::current()),
       surface_id_(surface_id) {
   GLHelper* helper = ImageTransportFactory::GetInstance()->GetGLHelper();
   MainThreadData& main = GetMain();
   main.mailbox = new OwnedMailbox(helper);
+  if (!compositor_thread_loop) {
+    impl_message_loop_ = main_message_loop_;
+  } else {
+    impl_message_loop_ = compositor_thread_loop;
+  }
   impl_message_loop_->PostTask(
       FROM_HERE,
       base::Bind(
           &ReflectorImpl::InitOnImplThread, this, main.mailbox->holder()));
 }
 
 ReflectorImpl::MainThreadData::MainThreadData(
     ui::Compositor* mirrored_compositor,
     ui::Layer* mirroring_layer)
     : needs_set_mailbox(true),
@@ skipping 203 matching lines @@
   main.mirroring_layer->SchedulePaint(new_rect);
 }
 
 void ReflectorImpl::FullRedrawContentOnMainThread(bool flip_texture) {
   MainThreadData& main = GetMain();
   main.flip_texture = flip_texture;
   main.mirrored_compositor->ScheduleFullRedraw();
 }
 
 }  // namespace content