cc: Use CheckedNumeric for resource size calculations.

cc/resources/prioritized_resource.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/prioritized_resource.h"
 
 #include <algorithm>
 
 #include "cc/resources/platform_color.h"
 #include "cc/resources/prioritized_resource_manager.h"
 #include "cc/resources/priority_calculator.h"
 #include "cc/trees/proxy.h"
 
 namespace cc {
 
 PrioritizedResource::PrioritizedResource(PrioritizedResourceManager* manager,
                                          const gfx::Size& size,
                                          ResourceFormat format)
     : size_(size),
       format_(format),
       bytes_(0),
       contents_swizzled_(false),
       priority_(PriorityCalculator::LowestPriority()),
       is_above_priority_cutoff_(false),
       is_self_managed_(false),
       backing_(NULL),
       manager_(NULL) {
-  bytes_ = Resource::MemorySizeBytes(size, format);
+  // We can use UncheckedMemorySizeBytes here, since the size is controlled by
+  // the compositor (used for tiles).
+  bytes_ = Resource::UncheckedMemorySizeBytes(size, format);
   if (manager)
     manager->RegisterTexture(this);
 }
 
 PrioritizedResource::~PrioritizedResource() {
   if (manager_)
     manager_->UnregisterTexture(this);
 }
 
 void PrioritizedResource::SetTextureManager(
     PrioritizedResourceManager* manager) {
   if (manager_ == manager)
     return;
   if (manager_)
     manager_->UnregisterTexture(this);
   if (manager)
     manager->RegisterTexture(this);
 }
 
 void PrioritizedResource::SetDimensions(const gfx::Size& size,
                                         ResourceFormat format) {
   if (format_ != format || size_ != size) {
     is_above_priority_cutoff_ = false;
     format_ = format;
     size_ = size;
-    bytes_ = Resource::MemorySizeBytes(size, format);
+    // We can use UncheckedMemorySizeBytes here, since the size is controlled by
+    // the compositor (used for tiles).
+    bytes_ = Resource::UncheckedMemorySizeBytes(size, format);
     DCHECK(manager_ || !backing_);
     if (manager_)
       manager_->ReturnBackingTexture(this);
   }
 }
 
 bool PrioritizedResource::RequestLate() {
   if (!manager_)
     return false;
   return manager_->RequestLate(this);
@@ skipping 129 matching lines @@
     manager_->ReturnBackingTexture(this);
 }
 
 const Proxy* PrioritizedResource::Backing::proxy() const {
   if (!owner_ || !owner_->resource_manager())
     return NULL;
   return owner_->resource_manager()->ProxyForDebug();
 }
 
 }  // namespace cc