sync compositor: pass simple gfx types by const ref

content/public/test/test_synchronous_compositor_android.cc

 // 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.
 
 #include "content/public/test/test_synchronous_compositor_android.h"
 
 #include "cc/output/compositor_frame.h"
 
 namespace content {
 
 TestSynchronousCompositor::TestSynchronousCompositor() : client_(NULL) {
 }
 
 TestSynchronousCompositor::~TestSynchronousCompositor() {
   SetClient(NULL);
 }
 
 void TestSynchronousCompositor::SetClient(SynchronousCompositorClient* client) {
   if (client_)
     client_->DidDestroyCompositor(this);
   client_ = client;
   if (client_)
     client_->DidInitializeCompositor(this);
 }
 
 scoped_ptr<cc::CompositorFrame> TestSynchronousCompositor::DemandDrawHw(
-    gfx::Size surface_size,
+    const gfx::Size& surface_size,
     const gfx::Transform& transform,
-    gfx::Rect viewport,
-    gfx::Rect clip,
-    gfx::Rect viewport_rect_for_tile_priority,
+    const gfx::Rect& viewport,
+    const gfx::Rect& clip,
+    const gfx::Rect& viewport_rect_for_tile_priority,
     const gfx::Transform& transform_for_tile_priority) {
   return hardware_frame_.Pass();
 }
 
 bool TestSynchronousCompositor::DemandDrawSw(SkCanvas* canvas) {
   DCHECK(canvas);
   return true;
 }
 
 void TestSynchronousCompositor::SetHardwareFrame(
     scoped_ptr<cc::CompositorFrame> frame) {
   hardware_frame_ = frame.Pass();
 }
 
 }  // namespace content