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

cc/scheduler/scheduler_state_machine_unittest.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_state_machine.h"
 
 #include "cc/scheduler/scheduler.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace cc {
@@ skipping 80 matching lines @@
     StateMachine state(default_scheduler_settings);
     state.SetCanStart();
     state.UpdateState(state.NextAction());
     state.DidCreateAndInitializeOutputSurface();
     state.SetVisible(true);
     state.UpdateState(
         SchedulerStateMachine::ACTION_SEND_BEGIN_FRAME_TO_MAIN_THREAD);
     EXPECT_EQ(SchedulerStateMachine::COMMIT_STATE_FRAME_IN_PROGRESS,
               state.CommitState());
     EXPECT_FALSE(state.NeedsCommit());
-    EXPECT_FALSE(state.BeginFrameNeededByImplThread());
+    EXPECT_TRUE(state.BeginFrameNeededByImplThread());
   }
 }
 
 TEST(SchedulerStateMachineTest, TestSetForcedRedrawDoesNotSetsNormalRedraw) {
   SchedulerSettings default_scheduler_settings;
   SchedulerStateMachine state(default_scheduler_settings);
   state.SetCanDraw(true);
   state.SetNeedsForcedRedraw();
   EXPECT_FALSE(state.RedrawPending());
   EXPECT_TRUE(state.BeginFrameNeededByImplThread());
@@ skipping 1175 matching lines @@
   EXPECT_TRUE(state.DrawSuspendedUntilCommit());
 
   EXPECT_EQ(SchedulerStateMachine::ACTION_COMMIT, state.NextAction());
 
   state.UpdateState(state.NextAction());
   EXPECT_FALSE(state.DrawSuspendedUntilCommit());
 }
 
 }  // namespace
 }  // namespace cc