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

cc/scheduler/scheduler_state_machine.h

 // Copyright 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_SCHEDULER_SCHEDULER_STATE_MACHINE_H_
 #define CC_SCHEDULER_SCHEDULER_STATE_MACHINE_H_
 
 #include <string>
 
 #include "base/basictypes.h"
+#include "base/time.h"
 #include "cc/base/cc_export.h"
 #include "cc/scheduler/scheduler_settings.h"
 
 namespace cc {
 
 // The SchedulerStateMachine decides how to coordinate main thread activites
 // like painting/running javascript with rendering and input activities on the
 // impl thread.
 //
 // The state machine tracks internal state but is also influenced by external
@@ skipping 50 matching lines @@
   void UpdateState(Action action);
 
   // Indicates whether the main thread needs a begin frame callback in order to
   // make progress.
   bool BeginFrameNeededByImplThread() const;
 
   // Indicates that the system has entered and left a BeginFrame callback.
   // 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);
 
   // Indicates that a redraw is required, either due to the impl tree changing
   // or the screen being damaged and simply needing redisplay.
   void SetNeedsRedraw();
 
   // As SetNeedsRedraw(), but ensures the draw will definitely happen even if
   // we are not visible.
@@ skipping 69 matching lines @@
   bool ShouldAttemptTreeActivation() const;
   bool ShouldAcquireLayerTexturesForMainThread() const;
   bool ShouldCheckForCompletedTileUploads() const;
   bool HasDrawnThisFrame() const;
   bool HasAttemptedTreeActivationThisFrame() const;
   bool HasCheckedForCompletedTileUploadsThisFrame() const;
 
   const SchedulerSettings settings_;
 
   CommitState commit_state_;
+  int commit_count_;
 
   int current_frame_number_;
   int last_frame_number_where_draw_was_called_;
   int last_frame_number_where_tree_activation_attempted_;
   int last_frame_number_where_check_for_completed_tile_uploads_called_;
   int consecutive_failed_draws_;
   int maximum_number_of_failed_draws_before_draw_is_forced_;
   bool needs_redraw_;
   bool swap_used_incomplete_tile_;
   bool needs_forced_redraw_;
   bool needs_forced_redraw_after_next_commit_;
   bool needs_commit_;
   bool needs_forced_commit_;
   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_;
   bool has_pending_tree_;
   bool draw_if_possible_failed_;
   TextureState texture_state_;
   OutputSurfaceState output_surface_state_;
   bool did_create_and_initialize_first_output_surface_;
 
+ private:
   DISALLOW_COPY_AND_ASSIGN(SchedulerStateMachine);
 };
 
 }  // namespace cc
 
 #endif  // CC_SCHEDULER_SCHEDULER_STATE_MACHINE_H_