cc: Split Proxy and TaskRunnerProvider for the LayerTreeHost

cc/trees/single_thread_proxy.h

Index: cc/trees/single_thread_proxy.h
diff --git a/cc/trees/single_thread_proxy.h b/cc/trees/single_thread_proxy.h
index ece5dffd8b1f4607541c980e667545aef5dd34b1..4b1a2767e26191f599849e44096defd0ca4ec705 100644
--- a/cc/trees/single_thread_proxy.h
+++ b/cc/trees/single_thread_proxy.h
@@ -15,6 +15,7 @@
 #include "cc/trees/blocking_task_runner.h"
 #include "cc/trees/layer_tree_host_impl.h"
 #include "cc/trees/proxy.h"
+#include "cc/trees/task_runner_provider.h"
 
 namespace cc {
 
@@ -30,7 +31,7 @@ class CC_EXPORT SingleThreadProxy : public Proxy,
   static scoped_ptr<Proxy> Create(
       LayerTreeHost* layer_tree_host,
       LayerTreeHostSingleThreadClient* client,
-      scoped_refptr<base::SingleThreadTaskRunner> main_task_runner,
+      TaskRunnerProvider* task_runner_provider_,
       scoped_ptr<BeginFrameSource> external_begin_frame_source);
   ~SingleThreadProxy() override;
 
@@ -119,11 +120,10 @@ class CC_EXPORT SingleThreadProxy : public Proxy,
   void CompositeImmediately(base::TimeTicks frame_begin_time);
 
  protected:
-  SingleThreadProxy(
-      LayerTreeHost* layer_tree_host,
-      LayerTreeHostSingleThreadClient* client,
-      scoped_refptr<base::SingleThreadTaskRunner> main_task_runner,
-      scoped_ptr<BeginFrameSource> external_begin_frame_source);
+  SingleThreadProxy(LayerTreeHost* layer_tree_host,
+                    LayerTreeHostSingleThreadClient* client,
+                    TaskRunnerProvider* task_runner_provider,
+                    scoped_ptr<BeginFrameSource> external_begin_frame_source);
 
  private:
   void BeginMainFrame(const BeginFrameArgs& begin_frame_args);
@@ -142,6 +142,8 @@ class CC_EXPORT SingleThreadProxy : public Proxy,
   LayerTreeHost* layer_tree_host_;
   LayerTreeHostSingleThreadClient* client_;
 
+  TaskRunnerProvider* task_runner_provider_;
+
   // Used on the Thread, but checked on main thread during
   // initialization/shutdown.
   scoped_ptr<LayerTreeHostImpl> layer_tree_host_impl_;