cc: Keep track of busy resources in ResourcePool

cc/resources/resource_pool.h

 // 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.
 
 #ifndef CC_RESOURCES_RESOURCE_POOL_H_
 #define CC_RESOURCES_RESOURCE_POOL_H_
 
 #include <list>
 
 #include "base/memory/scoped_ptr.h"
 #include "cc/base/cc_export.h"
 #include "cc/output/renderer.h"
 #include "cc/resources/resource.h"
 #include "cc/resources/resource_format.h"
+#include "cc/resources/resource_provider.h"
 
 namespace cc {
 
-class CC_EXPORT ResourcePool {
+class CC_EXPORT ResourcePool : public ResourceProviderClient {
  public:
   class CC_EXPORT Resource : public cc::Resource {
    public:
     Resource(ResourceProvider* resource_provider,
              gfx::Size size,
              ResourceFormat format);
     ~Resource();
 
    private:
     ResourceProvider* resource_provider_;
@@ skipping 20 matching lines @@
   size_t total_memory_usage_bytes() const {
     return memory_usage_bytes_;
   }
   size_t acquired_memory_usage_bytes() const {
     return memory_usage_bytes_ - unused_memory_usage_bytes_;
   }
   size_t acquired_resource_count() const {
     return resource_count_ - unused_resources_.size();
   }
 
+  // ResourceProviderClient implementation
+  virtual void ResourceExported(ResourceProvider::ResourceId id) OVERRIDE;
+  virtual void ResourceReturned(ResourceProvider::ResourceId id) OVERRIDE;
+
  protected:
   explicit ResourcePool(ResourceProvider* resource_provider);
 
   bool ResourceUsageTooHigh();
 
  private:
-  ResourceProvider* resource_provider_;
+  base::WeakPtr<ResourceProvider> resource_provider_;
   size_t max_memory_usage_bytes_;
   size_t max_unused_memory_usage_bytes_;
   size_t max_resource_count_;
   size_t memory_usage_bytes_;
   size_t unused_memory_usage_bytes_;
   size_t resource_count_;
 
   typedef std::list<Resource*> ResourceList;
   ResourceList unused_resources_;
+  ResourceList exported_resources_;
 
   DISALLOW_COPY_AND_ASSIGN(ResourcePool);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_RESOURCE_POOL_H_