Splitting DidSwap in cc::SwapPromise into WillSwap and DidSwap

content/renderer/gpu/queue_message_swap_promise.h

 // Copyright 2014 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 CONTENT_RENDERER_GPU_QUEUE_MESSAGE_SWAP_PROMISE_H_
 #define CONTENT_RENDERER_GPU_QUEUE_MESSAGE_SWAP_PROMISE_H_
 
 #include <stdint.h>
 
 #include "base/memory/ref_counted.h"
 #include "cc/output/swap_promise.h"
 
 namespace IPC {
 class SyncMessageFilter;
 }
 
 namespace content {
 
 class FrameSwapMessageQueue;
 
 class QueueMessageSwapPromise : public cc::SwapPromise {
  public:
   QueueMessageSwapPromise(scoped_refptr<IPC::SyncMessageFilter> message_sender,
                           scoped_refptr<FrameSwapMessageQueue> message_queue,
                           int source_frame_number);
 
   ~QueueMessageSwapPromise() override;
 
   void DidActivate() override;
-  void DidSwap(cc::CompositorFrameMetadata* metadata) override;
+  void WillSwap(cc::CompositorFrameMetadata* metadata) override;
+  void DidSwap() override;
   DidNotSwapAction DidNotSwap(DidNotSwapReason reason) override;
 
   int64_t TraceId() const override;
 
  private:
   void PromiseCompleted();
 
   scoped_refptr<IPC::SyncMessageFilter> message_sender_;
   scoped_refptr<content::FrameSwapMessageQueue> message_queue_;
   int source_frame_number_;
 #if DCHECK_IS_ON()
   bool completed_;
 #endif
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_GPU_QUEUE_MESSAGE_SWAP_PROMISE_H_