cc: Pass SurfaceId by const ref in more places

cc/surfaces/surface.h

 // 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.
 
 #ifndef CC_SURFACES_SURFACE_H_
 #define CC_SURFACES_SURFACE_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 22 matching lines @@
 class CompositorFrame;
 class CopyOutputRequest;
 class SurfaceManager;
 class SurfaceFactory;
 class SurfaceResourceHolder;
 
 class CC_SURFACES_EXPORT Surface {
  public:
   using DrawCallback = SurfaceFactory::DrawCallback;
 
-  Surface(SurfaceId id, SurfaceFactory* factory);
+  Surface(const SurfaceId& id, SurfaceFactory* factory);
   ~Surface();
 
-  SurfaceId surface_id() const { return surface_id_; }
-  SurfaceId previous_frame_surface_id() const {
+  const SurfaceId& surface_id() const { return surface_id_; }
+  const SurfaceId& previous_frame_surface_id() const {
     return previous_frame_surface_id_;
   }
 
   void SetPreviousFrameSurface(Surface* surface);
 
   void QueueFrame(CompositorFrame frame, const DrawCallback& draw_callback);
   void RequestCopyOfOutput(std::unique_ptr<CopyOutputRequest> copy_request);
   // Adds each CopyOutputRequest in the current frame to copy_requests. The
   // caller takes ownership of them.
   void TakeCopyOutputRequests(
@@ skipping 53 matching lines @@
   std::vector<SurfaceId> referenced_surfaces_;
 
   DrawCallback draw_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(Surface);
 };
 
 }  // namespace cc
 
 #endif  // CC_SURFACES_SURFACE_H_