[#6]Pass gfx structs by const ref (gfx::Vector2d)

content/renderer/gpu/render_widget_compositor.cc

 // Copyright (c) 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/gpu/render_widget_compositor.h"
 
 #include <limits>
 #include <string>
 
 #if defined(OS_ANDROID)
@@ skipping 550 matching lines @@
 }
 
 void RenderWidgetCompositor::Animate(double frame_begin_time) {
   widget_->webwidget()->animate(frame_begin_time);
 }
 
 void RenderWidgetCompositor::Layout() {
   widget_->webwidget()->layout();
 }
 
-void RenderWidgetCompositor::ApplyScrollAndScale(gfx::Vector2d scroll_delta,
-                                                 float page_scale) {
+void RenderWidgetCompositor::ApplyScrollAndScale(
+    const gfx::Vector2d& scroll_delta,
+    float page_scale) {
   widget_->webwidget()->applyScrollAndScale(scroll_delta, page_scale);
 }
 
 scoped_ptr<cc::OutputSurface> RenderWidgetCompositor::CreateOutputSurface(
     bool fallback) {
   return widget_->CreateOutputSurface(fallback);
 }
 
 void RenderWidgetCompositor::DidInitializeOutputSurface(bool success) {
   if (!success)
@@ skipping 41 matching lines @@
   widget_->OnSwapBuffersAborted();
 }
 
 void RenderWidgetCompositor::RateLimitSharedMainThreadContext() {
   cc::ContextProvider* provider =
       RenderThreadImpl::current()->SharedMainThreadContextProvider().get();
   provider->ContextGL()->RateLimitOffscreenContextCHROMIUM();
 }
 
 }  // namespace content