Trace the lifetime of CopyOutputRequest

cc/output/copy_output_request.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/copy_output_request.h"
 
 #include "base/bind.h"
 #include "base/callback_helpers.h"
 #include "base/logging.h"
 #include "cc/output/copy_output_result.h"
@@ skipping 17 matching lines @@
 }
 
 CopyOutputRequest::CopyOutputRequest() {}
 
 CopyOutputRequest::CopyOutputRequest(
     bool force_bitmap_result,
     const CopyOutputRequestCallback& result_callback)
     : force_bitmap_result_(force_bitmap_result),
       has_area_(false),
       has_texture_mailbox_(false),
-      result_callback_(result_callback) {}
+      result_callback_(result_callback) {
+  DCHECK(!result_callback_.is_null());
+  TRACE_EVENT_ASYNC_BEGIN0("cc", "CopyOutputRequest", this);
+}
 
 CopyOutputRequest::~CopyOutputRequest() {
-  if (!result_callback_.is_null())
+  if (!result_callback_.is_null()) {
     SendResult(CopyOutputResult::CreateEmptyResult().Pass());
+    TRACE_EVENT_ASYNC_END0("cc", "CopyOutputRequest", this);

[jdduke (slow), 2014/04/25 17:36:00]

Oops, forgot to delete this line.

+  }
 }
 
 void CopyOutputRequest::SendResult(scoped_ptr<CopyOutputResult> result) {
   base::ResetAndReturn(&result_callback_).Run(result.Pass());
+  TRACE_EVENT_ASYNC_END0("cc", "CopyOutputRequest", this);
 }
 
 void CopyOutputRequest::SendEmptyResult() {
   SendResult(CopyOutputResult::CreateEmptyResult().Pass());
 }
 
 void CopyOutputRequest::SendBitmapResult(scoped_ptr<SkBitmap> bitmap) {
   SendResult(CopyOutputResult::CreateBitmapResult(bitmap.Pass()).Pass());
 }
 
 void CopyOutputRequest::SendTextureResult(
     const gfx::Size& size,
     const TextureMailbox& texture_mailbox,
     scoped_ptr<SingleReleaseCallback> release_callback) {
   DCHECK(texture_mailbox.IsTexture());
   SendResult(CopyOutputResult::CreateTextureResult(
       size, texture_mailbox, release_callback.Pass()));
 }
 
 void CopyOutputRequest::SetTextureMailbox(
     const TextureMailbox& texture_mailbox) {
   DCHECK(!force_bitmap_result_);
   DCHECK(texture_mailbox.IsTexture());
   has_texture_mailbox_ = true;
   texture_mailbox_ = texture_mailbox;
 }
 
 }  // namespace cc