[PPAPI] Added a new Var subclass, ResourceVar.

ppapi/shared_impl/var.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_H_
 #define PPAPI_SHARED_IMPL_VAR_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/shared_memory.h"
 #include "base/platform_file.h"
 #include "ppapi/c/pp_var.h"
 #include "ppapi/shared_impl/host_resource.h"
 #include "ppapi/shared_impl/ppapi_shared_export.h"
 
 namespace ppapi {
 
 class ArrayBufferVar;
 class ArrayVar;
 class DictionaryVar;
 class NPObjectVar;
 class ProxyObjectVar;
+class ResourceVar;
 class StringVar;
 class VarTracker;
 
 // Var -------------------------------------------------------------------------
 
 // Represents a non-POD var.
 class PPAPI_SHARED_EXPORT Var : public base::RefCounted<Var> {
  public:
   virtual ~Var();
 
   // Returns a string representing the given var for logging purposes.
   static std::string PPVarToLogString(PP_Var var);
 
   virtual StringVar* AsStringVar();
   virtual ArrayBufferVar* AsArrayBufferVar();
   virtual NPObjectVar* AsNPObjectVar();
   virtual ProxyObjectVar* AsProxyObjectVar();
   virtual ArrayVar* AsArrayVar();
   virtual DictionaryVar* AsDictionaryVar();
+  virtual ResourceVar* AsResourceVar();
 
   // Creates a PP_Var corresponding to this object. The return value will have
   // one reference addrefed on behalf of the caller.
   PP_Var GetPPVar();
 
   // Returns the type of this var.
   virtual PP_VarType GetType() const = 0;
 
   // Returns the ID corresponing to the string or object if it exists already,
   // or 0 if an ID hasn't been generated for this object (the plugin is holding
@@ skipping 129 matching lines @@
   // return NULL if the PP_Var is not of ArrayBuffer type.
   static ArrayBufferVar* FromPPVar(PP_Var var);
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ArrayBufferVar);
 };
 
 }  // namespace ppapi
 
 #endif  // PPAPI_SHARED_IMPL_VAR_H_