Revert of Revert of Forward input and compositing tasks to the Blink scheduler

content/renderer/input/input_event_filter.h

Index: content/renderer/input/input_event_filter.h
diff --git a/content/renderer/input/input_event_filter.h b/content/renderer/input/input_event_filter.h
index a80b9f8c625b24307b5f2f6fea9533d8472beabd..0e39592a47c2efa180dbd2c3d094a13419f26b65 100644
--- a/content/renderer/input/input_event_filter.h
+++ b/content/renderer/input/input_event_filter.h
@@ -18,6 +18,7 @@
 
 namespace base {
 class MessageLoopProxy;
+class SingleThreadTaskRunner;
 }
 
 namespace IPC {
@@ -38,8 +39,10 @@
 class CONTENT_EXPORT InputEventFilter : public InputHandlerManagerClient,
                                         public IPC::MessageFilter {
  public:
-  InputEventFilter(IPC::Listener* main_listener,
-                   const scoped_refptr<base::MessageLoopProxy>& target_loop);
+  InputEventFilter(
+      IPC::Listener* main_listener,
+      const scoped_refptr<base::SingleThreadTaskRunner>& main_task_runner,
+      const scoped_refptr<base::MessageLoopProxy>& target_loop);
 
   // The |handler| is invoked on the thread associated with |target_loop| to
   // handle input events matching the filtered routes.
@@ -73,7 +76,7 @@
   void SendMessage(scoped_ptr<IPC::Message> message);
   void SendMessageOnIOThread(scoped_ptr<IPC::Message> message);
 
-  scoped_refptr<base::MessageLoopProxy> main_loop_;
+  scoped_refptr<base::SingleThreadTaskRunner> main_task_runner_;
   IPC::Listener* main_listener_;
 
   // The sender_ only gets invoked on the thread corresponding to io_loop_.