cc: Single-threaded impl-side painting for unit tests

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 21b9f88a58dc01d386da1074f19933bea9c1bebf..030f1ca9b708698e0dd6b7af07fa65fd9b2ff69e 100644
--- a/cc/trees/single_thread_proxy.h
+++ b/cc/trees/single_thread_proxy.h
@@ -11,6 +11,7 @@
 #include "cc/animation/animation_events.h"
 #include "cc/output/begin_frame_args.h"
 #include "cc/scheduler/scheduler.h"
+#include "cc/trees/blocking_task_runner.h"
 #include "cc/trees/layer_tree_host_impl.h"
 #include "cc/trees/proxy.h"
 #include "cc/trees/proxy_timing_history.h"
@@ -102,7 +103,7 @@ class CC_EXPORT SingleThreadProxy : public Proxy,
   virtual void PostDelayedScrollbarFadeOnImplThread(
       const base::Closure& start_fade,
       base::TimeDelta delay) override {}
-  virtual void DidActivateSyncTree() override {}
+  virtual void DidActivateSyncTree() override;
   virtual void DidManageTiles() override;
   virtual void SetDebugState(const LayerTreeDebugState& debug_state) override {}
 
@@ -119,11 +120,13 @@ class CC_EXPORT SingleThreadProxy : public Proxy,
 
   void BeginMainFrame();
   void BeginMainFrameAbortedOnImplThread();
-  void DoCommit(const BeginFrameArgs& begin_frame_args);
+  void DoBeginMainFrame(const BeginFrameArgs& begin_frame_args);
+  void DoCommit();
   DrawResult DoComposite(base::TimeTicks frame_begin_time,
                          LayerTreeHostImpl::FrameData* frame);
   void DoSwap();
   void DidCommitAndDrawFrame();
+  void CommitComplete();
 
   bool ShouldComposite() const;
   void UpdateBackgroundAnimateTicking();
@@ -141,6 +144,8 @@ class CC_EXPORT SingleThreadProxy : public Proxy,
   scoped_ptr<Scheduler> scheduler_on_impl_thread_;
   ProxyTimingHistory timing_history_;
 
+  scoped_ptr<BlockingTaskRunner::CapturePostTasks> commit_blocking_task_runner_;
+  scoped_ptr<ResourceUpdateQueue> queue_for_commit_;
   bool next_frame_is_newly_committed_frame_;
 
   bool inside_draw_;