[cc] Fix CompositorFrameSinkSupport BeginFrameAck interface.

content/renderer/android/synchronous_compositor_frame_sink.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 "content/renderer/android/synchronous_compositor_frame_sink.h"
 
 #include <vector>
 
 #include "base/auto_reset.h"
 #include "base/location.h"
@@ skipping 255 matching lines @@
     gfx::Transform child_transform;
     child_transform.Translate(
         gfx::Vector2dF(sw_viewport_for_current_draw_.OffsetFromOrigin()));
 
     // Make a root frame that embeds the frame coming from the layer compositor
     // and positions it based on the provided viewport.
     // TODO(danakj): We could apply the transform here instead of passing it to
     // the CompositorFrameSink client too? (We'd have to do the same for
     // hardware frames in SurfacesInstance?)
     cc::CompositorFrame embed_frame;
+    embed_frame.metadata.begin_frame_ack = frame.metadata.begin_frame_ack;
     embed_frame.render_pass_list.push_back(cc::RenderPass::Create());
 
     // The embedding RenderPass covers the entire Display's area.
     const auto& embed_render_pass = embed_frame.render_pass_list.back();
     embed_render_pass->SetNew(1, gfx::Rect(display_size),
                               gfx::Rect(display_size), gfx::Transform());
     embed_render_pass->has_transparent_background = false;
 
     // The RenderPass has a single SurfaceDrawQuad (and SharedQuadState for it).
     auto* shared_quad_state =
@@ skipping 184 matching lines @@
     const cc::ReturnedResourceArray& resources) {
   DCHECK(resources.empty());
   client_->ReclaimResources(resources);
 }
 
 void SynchronousCompositorFrameSink::WillDrawSurface(
     const cc::LocalSurfaceId& local_surface_id,
     const gfx::Rect& damage_rect) {}
 
 }  // namespace content