cc: Introduce embedded_surfaces in metadata for surface Ids in draw quads

cc/trees/layer_tree_host_impl.cc

Index: cc/trees/layer_tree_host_impl.cc
diff --git a/cc/trees/layer_tree_host_impl.cc b/cc/trees/layer_tree_host_impl.cc
index 7adf84033948a9c06372d7baf308eaeb5de8a325..62654865f4d51e641bd820b3652b2b945f2c1adc 100644
--- a/cc/trees/layer_tree_host_impl.cc
+++ b/cc/trees/layer_tree_host_impl.cc
@@ -973,6 +973,9 @@ DrawResult LayerTreeHostImpl::CalculateRenderPasses(FrameData* frame) {
         layer->set_was_ever_ready_since_last_transform_animation(true);
       }
     }
+    frame->embedded_surfaces.insert(frame->embedded_surfaces.end(),
+                                    append_quads_data.embedded_surfaces.begin(),
+                                    append_quads_data.embedded_surfaces.end());
   }
 
   // If CommitToActiveTree() is true, then we wait to draw until
@@ -1704,6 +1707,7 @@ bool LayerTreeHostImpl::DrawLayers(FrameData* frame) {
 
   CompositorFrameMetadata metadata = MakeCompositorFrameMetadata();
   metadata.may_contain_video = frame->may_contain_video;
+  metadata.embedded_surfaces = std::move(frame->embedded_surfaces);
   active_tree()->FinishSwapPromises(&metadata);
   for (auto& latency : metadata.latency_info) {
     TRACE_EVENT_WITH_FLOW1("input,benchmark", "LatencyInfo.Flow",