Trace the lifetime of CopyOutputRequest

cc/output/copy_output_request.cc

Index: cc/output/copy_output_request.cc
diff --git a/cc/output/copy_output_request.cc b/cc/output/copy_output_request.cc
index 56dac2a60bfe9de8a25acc5099ebb142e5b1e43d..dcae8e26127bf048af5299fcd236f5b248b3179a 100644
--- a/cc/output/copy_output_request.cc
+++ b/cc/output/copy_output_request.cc
@@ -35,15 +35,21 @@ CopyOutputRequest::CopyOutputRequest(
     : 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() {