[PPAPI] ResourceVar now reference counts its PP_Resource in the plugin.

ppapi/shared_impl/var_tracker.h

 // Copyright (c) 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 PPAPI_SHARED_IMPL_VAR_TRACKER_H_
 #define PPAPI_SHARED_IMPL_VAR_TRACKER_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 67 matching lines @@
   // into the new array buffer.
   PP_Var MakeArrayBufferPPVar(uint32 size_in_bytes,
                               base::SharedMemoryHandle h);
 
   // Create an ArrayBuffer and copy the contents of |data| in to it. The
   // returned object has 0 reference count in the tracker, and like all
   // RefCounted objects, has a 0 initial internal reference count. (You should
   // usually immediately put this in a scoped_refptr).
   ArrayBufferVar* MakeArrayBufferVar(uint32 size_in_bytes, const void* data);
 
+  // Creates a new resource var that points to a given resource ID. Returns a
+  // PP_Var that references it and has an initial reference count of 1.
+  PP_Var MakeResourcePPVar(PP_Resource pp_resource);
+
+  // Creates a new resource var that points to a given resource ID. This is
+  // implemented by the host and plugin tracker separately, because the plugin
+  // keeps a reference to the resource, and the host does not.
+  virtual ResourceVar* MakeResourceVar(PP_Resource pp_resource) = 0;
+
   // Return a vector containing all PP_Vars that are in the tracker. This is
   // to help implement PPB_Testing_Dev.GetLiveVars and should generally not be
   // used in production code. The PP_Vars are returned in no particular order,
   // and their reference counts are unaffected.
   std::vector<PP_Var> GetLiveVars();
 
   // Retrieves the internal reference counts for testing. Returns 0 if we
   // know about the object but the corresponding value is 0, or -1 if the
   // given object ID isn't in our map.
   int GetRefCountForObject(const PP_Var& object);
@@ skipping 108 matching lines @@
   // other threads (especially the IO thread). On the plugin side, the tracker
   // is protected by the proxy lock and is thread-safe, so this will be NULL.
   scoped_ptr<base::ThreadChecker> thread_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(VarTracker);
 };
 
 }  // namespace ppapi
 
 #endif  // PPAPI_SHARED_IMPL_VAR_TRACKER_H_