Replace source pointer in cc::CopyOutputRequest with a base::UnguessableToken

content/browser/renderer_host/delegated_frame_host.cc

 // 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.
 
 #include "content/browser/renderer_host/delegated_frame_host.h"
 
 #include <algorithm>
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 345 matching lines @@
       cc::CopyOutputRequest::CreateRequest(base::Bind(
           &DelegatedFrameHost::CopyFromCompositingSurfaceHasResultForVideo,
           AsWeakPtr(), subscriber_texture, frame,
           base::Bind(callback, present_time)));
   // Setting the source in this copy request asks that the layer abort any prior
   // uncommitted copy requests made on behalf of the same frame subscriber.
   // This will not affect any of the copy requests spawned elsewhere from
   // DelegatedFrameHost (e.g., a call to CopyFromCompositingSurface() for
   // screenshots) since those copy requests do not specify |frame_subscriber()|
   // as a source.
-  request->set_source(frame_subscriber());
+  request->set_source(frame_subscriber()->GetSourceIdForCopyRequest());
   if (subscriber_texture.get()) {
     request->SetTextureMailbox(cc::TextureMailbox(
         subscriber_texture->mailbox(), subscriber_texture->sync_token(),
         subscriber_texture->target()));
   }
 
   if (local_frame_id_.is_valid()) {
     // To avoid unnecessary composites, go directly to the Surface rather than
     // through RequestCopyOfOutput (which goes through the browser
     // compositor).
@@ skipping 490 matching lines @@
         std::move(request));
   }
 }
 
 void DelegatedFrameHost::UnlockResources() {
   DCHECK(local_frame_id_.is_valid());
   delegated_frame_evictor_->UnlockFrame();
 }
 
 }  // namespace content