[PPAPI] Added PP_VARTYPE_RESOURCE as a PP_VarType enum value.

ppapi/shared_impl/resource_var.cc

 // Copyright 2013 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 "ppapi/shared_impl/resource_var.h"
 
+#include "ppapi/shared_impl/ppapi_globals.h"
+#include "ppapi/shared_impl/var_tracker.h"
+
 namespace ppapi {
 
 ResourceVar::ResourceVar() : pp_resource_(0) {}
 
 ResourceVar::ResourceVar(PP_Resource pp_resource) : pp_resource_(pp_resource) {}
 
 ResourceVar::ResourceVar(const IPC::Message& creation_message)
     : pp_resource_(0),
       creation_message_(creation_message) {}
 
 ResourceVar::~ResourceVar() {}
 
 ResourceVar* ResourceVar::AsResourceVar() {
   return this;
 }
 
 PP_VarType ResourceVar::GetType() const {
-  // TODO(mgiuca): Return PP_VARTYPE_RESOURCE, once that is a valid enum value.
-  NOTREACHED();
-  return PP_VARTYPE_UNDEFINED;
+  return PP_VARTYPE_RESOURCE;
 }
 
 // static
 ResourceVar* ResourceVar::FromPPVar(PP_Var var) {
-  // TODO(mgiuca): Implement this function, once PP_VARTYPE_RESOURCE is
-  // introduced.
-  return NULL;
+  if (var.type != PP_VARTYPE_RESOURCE)
+    return NULL;
+  scoped_refptr<Var> var_object(
+      PpapiGlobals::Get()->GetVarTracker()->GetVar(var));
+  if (!var_object.get())
+    return NULL;
+  return var_object->AsResourceVar();
 }
 
 }  // namespace ppapi