cc: Handle retroactive BeginFrames in the Scheduler.

cc/scheduler/scheduler.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_H_
 #define CC_SCHEDULER_SCHEDULER_H_
 
+#include <deque>
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/cancelable_callback.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/time/time.h"
 #include "cc/base/cc_export.h"
 #include "cc/output/begin_frame_args.h"
 #include "cc/scheduler/draw_swap_readback_result.h"
 #include "cc/scheduler/scheduler_settings.h"
 #include "cc/scheduler/scheduler_state_machine.h"
 #include "cc/trees/layer_tree_host.h"
 
 namespace cc {
 
 class Thread;
 
 class SchedulerClient {
  public:
-  virtual void SetNeedsBeginImplFrame(bool enable) = 0;
+  virtual void SetNeedsBeginFrame(bool enable) = 0;
+  virtual void WillBeginImplFrame(const BeginFrameArgs& args) = 0;
   virtual void ScheduledActionSendBeginMainFrame() = 0;
   virtual DrawSwapReadbackResult ScheduledActionDrawAndSwapIfPossible() = 0;
   virtual DrawSwapReadbackResult ScheduledActionDrawAndSwapForced() = 0;
   virtual DrawSwapReadbackResult ScheduledActionDrawAndReadback() = 0;
   virtual void ScheduledActionCommit() = 0;
   virtual void ScheduledActionUpdateVisibleTiles() = 0;
   virtual void ScheduledActionActivatePendingTree() = 0;
   virtual void ScheduledActionBeginOutputSurfaceCreation() = 0;
   virtual void ScheduledActionAcquireLayerTexturesForMainThread() = 0;
   virtual void ScheduledActionManageTiles() = 0;
@@ skipping 65 matching lines @@
   }
 
   bool WillDrawIfNeeded() const;
 
   base::TimeTicks AnticipatedDrawTime() const;
 
   void NotifyBeginMainFrameStarted();
 
   base::TimeTicks LastBeginImplFrameTime();
 
+  void BeginFrame(const BeginFrameArgs& args);
+  void BeginRetroFrame();
   void BeginImplFrame(const BeginFrameArgs& args);
   void OnBeginImplFrameDeadline();
   void PollForAnticipatedDrawTriggers();
 
   scoped_ptr<base::Value> StateAsValue() const;
 
   bool IsInsideAction(SchedulerStateMachine::Action action) {
     return inside_action_ == action;
   }
 
   bool IsBeginMainFrameSent() const;
 
  private:
   Scheduler(SchedulerClient* client,
             const SchedulerSettings& scheduler_settings,
             int layer_tree_host_id,
             const scoped_refptr<base::SequencedTaskRunner>& impl_task_runner);
 
-  base::TimeTicks AdjustedBeginImplFrameDeadline() const;
+  base::TimeTicks AdjustedBeginImplFrameDeadline(
+      const BeginFrameArgs& args) const;
   void ScheduleBeginImplFrameDeadline(base::TimeTicks deadline);
-  void SetupNextBeginImplFrameIfNeeded();
+  void SetupNextBeginFrameIfNeeded();
   void ActivatePendingTree();
   void DrawAndSwapIfPossible();
   void DrawAndSwapForced();
   void DrawAndReadback();
   void ProcessScheduledActions();
 
   bool CanCommitAndActivateBeforeDeadline() const;
   void AdvanceCommitStateIfPossible();
 
   bool IsBeginMainFrameSentOrStarted() const;
 
   const SchedulerSettings settings_;
   SchedulerClient* client_;
   int layer_tree_host_id_;
   scoped_refptr<base::SequencedTaskRunner> impl_task_runner_;
 
-  bool last_set_needs_begin_impl_frame_;
-  BeginFrameArgs last_begin_impl_frame_args_;
+  bool last_set_needs_begin_frame_;
+  bool begin_retro_frame_posted_;
+
+  std::deque<BeginFrameArgs> begin_retro_frame_args_;
+  BeginFrameArgs begin_impl_frame_args_;
+
   base::CancelableClosure begin_impl_frame_deadline_closure_;
   base::CancelableClosure poll_for_draw_triggers_closure_;
   base::RepeatingTimer<Scheduler> advance_commit_state_timer_;
 
   SchedulerStateMachine state_machine_;
   bool inside_process_scheduled_actions_;
   SchedulerStateMachine::Action inside_action_;
 
   base::WeakPtrFactory<Scheduler> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(Scheduler);
 };
 
 }  // namespace cc
 
 #endif  // CC_SCHEDULER_SCHEDULER_H_