cc: Emulate BeginFrame in OutputSurfaces that don't support it natively

cc/scheduler/scheduler_state_machine.h

Index: cc/scheduler/scheduler_state_machine.h
diff --git a/cc/scheduler/scheduler_state_machine.h b/cc/scheduler/scheduler_state_machine.h
index 1be07496931c8b8f4c0cf7e779b2ce145d2ba863..59e940c518ce2516b08bce3d3ac89e7675ea38a9 100644
--- a/cc/scheduler/scheduler_state_machine.h
+++ b/cc/scheduler/scheduler_state_machine.h
@@ -8,6 +8,7 @@
 #include <string>
 
 #include "base/basictypes.h"
+#include "base/time.h"
 #include "cc/base/cc_export.h"
 #include "cc/scheduler/scheduler_settings.h"
 
@@ -78,7 +79,9 @@ class CC_EXPORT SchedulerStateMachine {
   // The scheduler will not draw more than once in a given BeginFrame
   // callback.
   void DidEnterBeginFrame();
+  void SetFrameTime(base::TimeTicks frame_time);
   void DidLeaveBeginFrame();
+  bool inside_begin_frame() const { return inside_begin_frame_; }
 
   // Indicates whether the LayerTreeHostImpl is visible.
   void SetVisible(bool visible);
@@ -168,6 +171,7 @@ class CC_EXPORT SchedulerStateMachine {
   const SchedulerSettings settings_;
 
   CommitState commit_state_;
+  int commit_count_;
 
   int current_frame_number_;
   int last_frame_number_where_draw_was_called_;
@@ -184,6 +188,7 @@ class CC_EXPORT SchedulerStateMachine {
   bool expect_immediate_begin_frame_for_main_thread_;
   bool main_thread_needs_layer_textures_;
   bool inside_begin_frame_;
+  base::TimeTicks last_frame_time_;
   bool visible_;
   bool can_start_;
   bool can_draw_;
@@ -193,6 +198,7 @@ class CC_EXPORT SchedulerStateMachine {
   OutputSurfaceState output_surface_state_;
   bool did_create_and_initialize_first_output_surface_;
 
+ private:
   DISALLOW_COPY_AND_ASSIGN(SchedulerStateMachine);
 };