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

cc/resources/resource_provider.cc

 // Copyright 2012 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 "cc/resources/resource_provider.h"
 
 #include <algorithm>
 #include <limits>
 
 #include "base/containers/hash_tables.h"
@@ skipping 582 matching lines @@
 
 ResourceProvider::ResourceType ResourceProvider::GetResourceType(
     ResourceId id) {
   return GetResource(id)->type;
 }
 
 void ResourceProvider::SetPixels(ResourceId id,
                                  const uint8_t* image,
                                  const gfx::Rect& image_rect,
                                  const gfx::Rect& source_rect,
-                                 gfx::Vector2d dest_offset) {
+                                 const gfx::Vector2d& dest_offset) {
   Resource* resource = GetResource(id);
   DCHECK(!resource->locked_for_write);
   DCHECK(!resource->lock_for_read_count);
   DCHECK(resource->origin == Resource::Internal);
   DCHECK_EQ(resource->exported_count, 0);
   DCHECK(ReadLockFenceHasPassed(resource));
   LazyAllocate(resource);
 
   if (resource->gl_id) {
     DCHECK(!resource->pending_set_pixels);
@@ skipping 1237 matching lines @@
   gl->GetIntegerv(GL_ACTIVE_TEXTURE, &active_unit);
   return active_unit;
 }
 
 GLES2Interface* ResourceProvider::ContextGL() const {
   ContextProvider* context_provider = output_surface_->context_provider();
   return context_provider ? context_provider->ContextGL() : NULL;
 }
 
 }  // namespace cc