content: Add an overridable task runner to ChildThreadImpl

content/renderer/render_thread_impl.h

 // 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.
 
 #ifndef CONTENT_RENDERER_RENDER_THREAD_IMPL_H_
 #define CONTENT_RENDERER_RENDER_THREAD_IMPL_H_
 
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 113 matching lines @@
 // routed to the RenderThread according to the routing IDs of the messages.
 // The routing IDs correspond to RenderView instances.
 class CONTENT_EXPORT RenderThreadImpl
     : public RenderThread,
       public ChildThreadImpl,
       public GpuChannelHostFactory,
       NON_EXPORTED_BASE(public CompositorDependencies) {
  public:
   static RenderThreadImpl* current();
 
-  RenderThreadImpl();
+  explicit RenderThreadImpl(scoped_ptr<RendererScheduler> renderer_scheduler);
   // Constructor that's used when running in single process mode.
-  explicit RenderThreadImpl(const std::string& channel_name);
+  RenderThreadImpl(const std::string& channel_name,
+                   scoped_ptr<RendererScheduler> renderer_scheduler);
   // Constructor that's used in RendererMain.
-  explicit RenderThreadImpl(scoped_ptr<base::MessageLoop> main_message_loop);
+  RenderThreadImpl(scoped_ptr<base::MessageLoop> main_message_loop,
+                   scoped_ptr<RendererScheduler> renderer_scheduler);
   ~RenderThreadImpl() override;
   void Shutdown() override;
 
   // When initializing WebKit, ensure that any schemes needed for the content
   // module are registered properly.  Static to allow sharing with tests.
   static void RegisterSchemes();
 
   // Notify V8 that the date/time configuration of the system might have
   // changed.
   static void NotifyTimezoneChange();
@@ skipping 479 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(RenderThreadImpl);
 };
 
 #if defined(COMPILER_MSVC)
 #pragma warning(pop)
 #endif
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_THREAD_IMPL_H_