cc: modify the waiting condition of forced commit

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 <string>
 
 #include "base/basictypes.h"
@@ skipping 100 matching lines @@
   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);
 
   void PostBeginImplFrameDeadline(base::TimeTicks deadline);
   void SetupNextBeginImplFrameIfNeeded();
   void ActivatePendingTree();
   void DrawAndSwapIfPossible();
   void DrawAndSwapForced();
@@ skipping 20 matching lines @@
   SchedulerStateMachine::Action inside_action_;
 
   base::WeakPtrFactory<Scheduler> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(Scheduler);
 };
 
 }  // namespace cc
 
 #endif  // CC_SCHEDULER_SCHEDULER_H_