cc: Record UMA for swap to swap ack latency.

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/logging.h"
@@ skipping 180 matching lines @@
   DCHECK(!IsInsideAction(SchedulerStateMachine::ACTION_PREPARE_TILES));
   state_machine_.SetNeedsPrepareTiles();
   ProcessScheduledActions();
 }
 
 void Scheduler::SetMaxSwapsPending(int max) {
   state_machine_.SetMaxSwapsPending(max);
 }
 
 void Scheduler::DidSwapBuffers() {
+  compositor_timing_history_->DidSwapBuffers();
   state_machine_.DidSwapBuffers();
 
   // There is no need to call ProcessScheduledActions here because
   // swapping should not trigger any new actions.
   if (!inside_process_scheduled_actions_) {
     DCHECK_EQ(state_machine_.NextAction(), SchedulerStateMachine::ACTION_NONE);
   }
 }
 
 void Scheduler::DidSwapBuffersComplete() {
   DCHECK_GT(state_machine_.pending_swaps(), 0) << AsValue()->ToString();
+  compositor_timing_history_->DidSwapBuffersComplete();
   state_machine_.DidSwapBuffersComplete();
   ProcessScheduledActions();
 }
 
 void Scheduler::SetSmoothnessMode(bool smoothness_takes_priority,
                                   bool scroll_affects_scroll_handler) {
   state_machine_.SetSmoothnessMode(smoothness_takes_priority,
                                    scroll_affects_scroll_handler);
   ProcessScheduledActions();
 }
@@ skipping 31 matching lines @@
   begin_retro_frame_task_.Cancel();
   state_machine_.DidLoseOutputSurface();
   UpdateCompositorTimingHistoryRecordingEnabled();
   ProcessScheduledActions();
 }
 
 void Scheduler::DidCreateAndInitializeOutputSurface() {
   TRACE_EVENT0("cc", "Scheduler::DidCreateAndInitializeOutputSurface");
   DCHECK(!frame_source_->NeedsBeginFrames());
   DCHECK(begin_impl_frame_deadline_task_.IsCancelled());
+  compositor_timing_history_->DidSwapBuffersReset();
   state_machine_.DidCreateAndInitializeOutputSurface();
   UpdateCompositorTimingHistoryRecordingEnabled();
   ProcessScheduledActions();
 }
 
 void Scheduler::NotifyBeginMainFrameStarted(
     base::TimeTicks main_thread_start_time) {
   TRACE_EVENT0("cc", "Scheduler::NotifyBeginMainFrameStarted");
   state_machine_.NotifyBeginMainFrameStarted();
   compositor_timing_history_->BeginMainFrameStarted(main_thread_start_time);
@@ skipping 610 matching lines @@
 }
 
 bool Scheduler::IsBeginMainFrameSentOrStarted() const {
   return (state_machine_.begin_main_frame_state() ==
               SchedulerStateMachine::BEGIN_MAIN_FRAME_STATE_SENT ||
           state_machine_.begin_main_frame_state() ==
               SchedulerStateMachine::BEGIN_MAIN_FRAME_STATE_STARTED);
 }
 
 }  // namespace cc