Create a new action triggered when a BeginMainFrame is not expected before vsync

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 <stddef.h>
 
 #include "base/trace_event/trace_event.h"
 #include "cc/output/begin_frame_args.h"
@@ skipping 186 matching lines @@
       return;
 
     case SchedulerStateMachine::ACTION_ACTIVATE_SYNC_TREE:
       sm->WillActivate();
       return;
 
     case SchedulerStateMachine::ACTION_SEND_BEGIN_MAIN_FRAME:
       sm->WillSendBeginMainFrame();
       return;
 
+    case SchedulerStateMachine::ACTION_DO_IDLE_WORK:
+      sm->WillDoIdleWork();
+      return;
+
     case SchedulerStateMachine::ACTION_COMMIT: {
       bool commit_has_no_updates = false;
       sm->WillCommit(commit_has_no_updates);
       return;
     }
 
     case SchedulerStateMachine::ACTION_DRAW_FORCED:
     case SchedulerStateMachine::ACTION_DRAW_IF_POSSIBLE: {
       sm->WillDraw();
       sm->DidDraw(sm->draw_result_for_test());
@@ skipping 2510 matching lines @@
   state.OnBeginImplFrameDeadline();
   EXPECT_ACTION_UPDATE_STATE(SchedulerStateMachine::ACTION_NONE);
   EXPECT_SEQUENCE_NUMBERS(10u, 10u, 10u, BeginFrameArgs::kInvalidFrameNumber,
                           BeginFrameArgs::kInvalidFrameNumber);
   state.OnBeginImplFrameIdle();
   EXPECT_ACTION_UPDATE_STATE(SchedulerStateMachine::ACTION_NONE);
 }
 
 }  // namespace
 }  // namespace cc