cc: Don't pass simple well-defined classes by reference.

cc/resources/resource_pool.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_pool.h"
 
 #include "cc/resources/resource_provider.h"
 
 namespace cc {
 
 ResourcePool::Resource::Resource(cc::ResourceProvider* resource_provider,
-                                 const gfx::Size& size,
+                                 gfx::Size size,
                                  GLenum format)
     : cc::Resource(resource_provider->CreateManagedResource(
                        size,
                        format,
                        ResourceProvider::TextureUsageAny),
                    size,
                    format),
       resource_provider_(resource_provider) {
   DCHECK(id());
 }
@@ skipping 10 matching lines @@
       max_unused_memory_usage_bytes_(0),
       memory_usage_bytes_(0),
       unused_memory_usage_bytes_(0) {
 }
 
 ResourcePool::~ResourcePool() {
   SetMaxMemoryUsageBytes(0, 0);
 }
 
 scoped_ptr<ResourcePool::Resource> ResourcePool::AcquireResource(
-    const gfx::Size& size, GLenum format) {
+    gfx::Size size, GLenum format) {
   for (ResourceList::iterator it = resources_.begin();
        it != resources_.end(); ++it) {
     Resource* resource = *it;
 
     // TODO(epenner): It would be nice to DCHECK that this
     // doesn't happen two frames in a row for any resource
     // in this pool.
     if (!resource_provider_->CanLockForWrite(resource->id()))
       continue;
 
@@ skipping 53 matching lines @@
 
 bool ResourcePool::MemoryUsageTooHigh() {
   if (memory_usage_bytes_ > max_memory_usage_bytes_)
     return true;
   if (unused_memory_usage_bytes_ > max_unused_memory_usage_bytes_)
     return true;
   return false;
 }
 
 }  // namespace cc