Forward input tasks to the Blink scheduler

cc/trees/proxy.h

Index: cc/trees/proxy.h
diff --git a/cc/trees/proxy.h b/cc/trees/proxy.h
index 838e44f855c2e109c3bf71676312ae8f086d156b..5fc29bcec1ed6f700225742009a2b1157323e04c 100644
--- a/cc/trees/proxy.h
+++ b/cc/trees/proxy.h
@@ -15,6 +15,7 @@
 #include "base/time/time.h"
 #include "base/values.h"
 #include "cc/base/cc_export.h"
+#include "cc/trees/main_thread_task_runner.h"
 
 namespace base { class SingleThreadTaskRunner; }
 
@@ -26,6 +27,7 @@ class Vector2d;
 namespace cc {
 
 class LayerTreeDebugState;
+class MainThreadTaskRunner;
 class OutputSurface;
 struct RendererCapabilities;
 
@@ -33,7 +35,7 @@ struct RendererCapabilities;
 // the compositor over to the compositor implementation.
 class CC_EXPORT Proxy {
  public:
-  base::SingleThreadTaskRunner* MainThreadTaskRunner() const;
+  MainThreadTaskRunner* MainThreadTaskRunner() const;
   bool HasImplThread() const;
   base::SingleThreadTaskRunner* ImplThreadTaskRunner() const;
 
@@ -100,14 +102,14 @@ class CC_EXPORT Proxy {
   virtual scoped_ptr<base::Value> SchedulerAsValueForTesting();
 
  protected:
-  explicit Proxy(
-      scoped_refptr<base::SingleThreadTaskRunner> impl_task_runner);
+  Proxy(scoped_refptr<cc::MainThreadTaskRunner> main_task_runner,
+        scoped_refptr<base::SingleThreadTaskRunner> impl_task_runner);
   friend class DebugScopedSetImplThread;
   friend class DebugScopedSetMainThread;
   friend class DebugScopedSetMainThreadBlocked;
 
  private:
-  scoped_refptr<base::SingleThreadTaskRunner> main_task_runner_;
+  scoped_refptr<cc::MainThreadTaskRunner> main_task_runner_;
   scoped_refptr<base::SingleThreadTaskRunner> impl_task_runner_;
 #if DCHECK_IS_ON
   const base::PlatformThreadId main_thread_id_;