Splitting DidSwap in cc::SwapPromise into WillSwap and DidSwap

cc/output/latency_info_swap_promise.cc

 // Copyright 2013 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/output/latency_info_swap_promise.h"
 
 #include <stdint.h>
 
 #include "base/logging.h"
 #include "base/trace_event/trace_event.h"
@@ skipping 17 matching lines @@
 
 namespace cc {
 
 LatencyInfoSwapPromise::LatencyInfoSwapPromise(const ui::LatencyInfo& latency)
     : latency_(latency) {
 }
 
 LatencyInfoSwapPromise::~LatencyInfoSwapPromise() {
 }
 
-void LatencyInfoSwapPromise::DidSwap(CompositorFrameMetadata* metadata) {
+void LatencyInfoSwapPromise::WillSwap(CompositorFrameMetadata* metadata) {
   DCHECK(!latency_.terminated());
   metadata->latency_info.push_back(latency_);
 }
 
+void LatencyInfoSwapPromise::DidSwap() {}
+
 SwapPromise::DidNotSwapAction LatencyInfoSwapPromise::DidNotSwap(
     DidNotSwapReason reason) {
   latency_.AddLatencyNumber(DidNotSwapReasonToLatencyComponentType(reason), 0,
                             0);
   // TODO(miletus): Turn this back on once per-event LatencyInfo tracking
   // is enabled in GPU side.
   // DCHECK(latency_.terminated);
   return DidNotSwapAction::BREAK_PROMISE;
 }
 
 int64_t LatencyInfoSwapPromise::TraceId() const {
   return latency_.trace_id();
 }
 
 // Trace the original LatencyInfo of a LatencyInfoSwapPromise
 void LatencyInfoSwapPromise::OnCommit() {
   TRACE_EVENT_WITH_FLOW1("input,benchmark",
                          "LatencyInfo.Flow",
                          TRACE_ID_DONT_MANGLE(TraceId()),
                          TRACE_EVENT_FLAG_FLOW_IN | TRACE_EVENT_FLAG_FLOW_OUT,
                          "step", "HandleInputEventMainCommit");
 }
 
 }  // namespace cc