[content] Expose renderer scheduler task queues in content::RenderThread.

content/public/renderer/render_thread.h

Index: content/public/renderer/render_thread.h
diff --git a/content/public/renderer/render_thread.h b/content/public/renderer/render_thread.h
index 86e7e9f2f9a4c6650cf73ca011dac54afb49c630..3e1759c9d35bb21ae158034a4db0a344cc494acd 100644
--- a/content/public/renderer/render_thread.h
+++ b/content/public/renderer/render_thread.h
@@ -106,6 +106,11 @@ class CONTENT_EXPORT RenderThread : virtual public ChildThread {
 
   // Retrieve the process ID of the browser process.
   virtual int32_t GetClientId() = 0;
+
+  // Handles for posting tasks to appropriate renderer scheduler task queues.
+  virtual scoped_refptr<base::SingleThreadTaskRunner> GetTimerTaskRunner() = 0;
+  virtual scoped_refptr<base::SingleThreadTaskRunner>
+  GetLoadingTaskRunner() = 0;
 };
 
 }  // namespace content