cc: modify the waiting condition of forced commit

cc/scheduler/scheduler.cc

 // 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.
 
 #include "cc/scheduler/scheduler.h"
 
 #include <algorithm>
 #include "base/auto_reset.h"
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
@@ skipping 276 matching lines @@
 }
 
 void Scheduler::PollForAnticipatedDrawTriggers() {
   TRACE_EVENT0("cc", "Scheduler::PollForAnticipatedDrawTriggers");
   poll_for_draw_triggers_closure_.Cancel();
   state_machine_.DidEnterPollForAnticipatedDrawTriggers();
   ProcessScheduledActions();
   state_machine_.DidLeavePollForAnticipatedDrawTriggers();
 }
 
+bool Scheduler::IsBeginMainFrameSent() const {
+  return state_machine_.commit_state() ==
+         SchedulerStateMachine::COMMIT_STATE_BEGIN_MAIN_FRAME_SENT;
+}
+
 void Scheduler::DrawAndSwapIfPossible() {
   DrawSwapReadbackResult result =
       client_->ScheduledActionDrawAndSwapIfPossible();
   state_machine_.DidDrawIfPossibleCompleted(result.draw_result);
 }
 
 void Scheduler::DrawAndSwapForced() {
   client_->ScheduledActionDrawAndSwapForced();
 }
 
@@ skipping 112 matching lines @@
 }
 
 bool Scheduler::IsBeginMainFrameSentOrStarted() const {
   return (state_machine_.commit_state() ==
               SchedulerStateMachine::COMMIT_STATE_BEGIN_MAIN_FRAME_SENT ||
           state_machine_.commit_state() ==
               SchedulerStateMachine::COMMIT_STATE_BEGIN_MAIN_FRAME_STARTED);
 }
 
 }  // namespace cc