Proxy the PPP_Printing interface

ppapi/shared_impl/resource_tracker.h

 // Copyright (c) 2011 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 PPAPI_SHARED_IMPL_RESOURCE_TRACKER_H_
 #define PPAPI_SHARED_IMPL_RESOURCE_TRACKER_H_
 
 #include <set>
 
 #include "base/basictypes.h"
 #include "base/hash_tables.h"
 #include "base/memory/linked_ptr.h"
+#include "base/memory/weak_ptr.h"
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/c/pp_resource.h"
 #include "ppapi/shared_impl/ppapi_shared_export.h"
 
 namespace ppapi {
 
 class Resource;
 
 class PPAPI_SHARED_EXPORT ResourceTracker {
  public:
   ResourceTracker();
   virtual ~ResourceTracker();
 
   // The returned pointer will be NULL if there is no resource. The reference
   // count of the resource is unaffected.
   Resource* GetResource(PP_Resource res) const;
 
   void AddRefResource(PP_Resource res);
   void ReleaseResource(PP_Resource res);
 
+  // Releases a reference on the given resource once the message loop returns.
+  void ReleaseResourceSoon(PP_Resource res);
+
   // Notifies the tracker that a new instance has been created. This must be
   // called before creating any resources associated with the instance.
   void DidCreateInstance(PP_Instance instance);
 
   // Called when an instance is being deleted. All plugin refs for the
   // associated resources will be force freed, and the resources (if they still
   // exist) will be disassociated from the instance.
   void DidDeleteInstance(PP_Instance instance);
 
   // Returns the number of resources associated with the given instance.
@@ skipping 40 matching lines @@
   // behalf of the plugin. When it drops to 0, we free that ref, keeping
   // the resource in the list.
   //
   // A resource will be in this list as long as the object is alive.
   typedef std::pair<Resource*, int> ResourceAndRefCount;
   typedef base::hash_map<PP_Resource, ResourceAndRefCount> ResourceMap;
   ResourceMap live_resources_;
 
   int32 last_resource_value_;
 
+  base::WeakPtrFactory<ResourceTracker> weak_ptr_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(ResourceTracker);
 };
 
 }  // namespace ppapi
 
 #endif  // PPAPI_SHARED_IMPL_RESOURCE_TRACKER_H_