Reland of "Decouple GpuCompositorFrameSink from DisplayCompositor"

cc/surfaces/surface_manager.cc

Index: cc/surfaces/surface_manager.cc
diff --git a/cc/surfaces/surface_manager.cc b/cc/surfaces/surface_manager.cc
index b290726c18478eae63b932d2db4eab7fbab66582..cfdc7a112a4776136bad76d3166f31ca6023a496 100644
--- a/cc/surfaces/surface_manager.cc
+++ b/cc/surfaces/surface_manager.cc
@@ -219,6 +219,24 @@ void SurfaceManager::RemoveSurfaceReference(const SurfaceId& parent_id,
   GarbageCollectSurfaces();
 }
 
+void SurfaceManager::AddSurfaceReferences(
+    const std::vector<SurfaceReference>& references) {
+  DCHECK(thread_checker_.CalledOnValidThread());
+
+  for (const auto& reference : references)
+    AddSurfaceReference(reference.parent_id(), reference.child_id());
+}
+
+void SurfaceManager::RemoveSurfaceReferences(
+    const std::vector<SurfaceReference>& references) {
+  DCHECK(thread_checker_.CalledOnValidThread());
+
+  // TODO(kylechar): Each remove reference can trigger GC, it would be better if
+  // we GC only once if removing multiple references.
+  for (const auto& reference : references)
+    RemoveSurfaceReference(reference.parent_id(), reference.child_id());
+}
+
 size_t SurfaceManager::GetSurfaceReferenceCount(
     const SurfaceId& surface_id) const {
   auto iter = child_to_parent_refs_.find(surface_id);