[cc] Set BeginFrame sequence numbers on CompositorFrames from Scheduler.

cc/trees/layer_tree_host_impl.cc

 // Copyright 2011 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/trees/layer_tree_host_impl.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 1687 matching lines @@
 
   // Collect all resource ids in the render passes into a single array.
   ResourceProvider::ResourceIdArray resources;
   for (const auto& render_pass : frame->render_passes) {
     for (auto* quad : render_pass->quad_list) {
       for (ResourceId resource_id : quad->resources)
         resources.push_back(resource_id);
     }
   }
 
+  DCHECK_LE(BeginFrameArgs::kStartingFrameNumber,
+            frame->begin_frame_ack.sequence_number);
+  metadata.begin_frame_ack = frame->begin_frame_ack;
+
   CompositorFrame compositor_frame;
   compositor_frame.metadata = std::move(metadata);
   resource_provider_->PrepareSendToParent(resources,
                                           &compositor_frame.resource_list);
   compositor_frame.render_pass_list = std::move(frame->render_passes);
   compositor_frame_sink_->SubmitCompositorFrame(std::move(compositor_frame));
 
   // Clears the list of swap promises after calling DidSwap on each of them to
   // signal that the swap is over.
   active_tree()->ClearSwapPromises();
@@ skipping 2422 matching lines @@
       worker_context_visibility_ =
           worker_context->CacheController()->ClientBecameVisible();
     } else {
       worker_context->CacheController()->ClientBecameNotVisible(
           std::move(worker_context_visibility_));
     }
   }
 }
 
 }  // namespace cc