Fix failing (flaky) LayerTreeHostTestLCDNotification test.

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>
 
@@ skipping 80 matching lines @@
 
   void SetSmoothnessTakesPriority(bool smoothness_takes_priority);
 
   void NotifyReadyToCommit();
   void BeginMainFrameAborted(bool did_handle);
 
   void DidManageTiles();
   void DidLoseOutputSurface();
   void DidCreateAndInitializeOutputSurface();
 
+  // Tests do not want to shut down until all possible BeginMainFrames have
+  // occured to prevent flakiness.
+  bool MainFrameForTestingWillHappen() const {
+    return state_machine_.CommitPending() ||
+           state_machine_.CouldSendBeginMainFrame();
+  }
+
   bool CommitPending() const { return state_machine_.CommitPending(); }
   bool RedrawPending() const { return state_machine_.RedrawPending(); }
   bool ManageTilesPending() const {
     return state_machine_.ManageTilesPending();
   }
   bool MainThreadIsInHighLatencyMode() const {
     return state_machine_.MainThreadIsInHighLatencyMode();
   }
   bool BeginImplFrameDeadlinePending() const {
     return !begin_impl_frame_deadline_task_.IsCancelled();
@@ skipping 115 matching lines @@
   void SetupSyntheticBeginFrames();
 
   base::WeakPtrFactory<Scheduler> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(Scheduler);
 };
 
 }  // namespace cc
 
 #endif  // CC_SCHEDULER_SCHEDULER_H_