Add a unified resource tracker shared between the proxy and the impl.

ppapi/shared_impl/resource_object_base.cc

-// 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.
-
-#include "ppapi/shared_impl/resource_object_base.h"
-
-#include "base/logging.h"
-
-namespace ppapi {
-
-ResourceObjectBase::ResourceObjectBase(PP_Instance instance)
-    : pp_instance_(instance) {
-  // Instance should be valid (nonzero).
-  DCHECK(instance);
-}
-
-ResourceObjectBase::~ResourceObjectBase() {
-}
-
-#define DEFINE_TYPE_GETTER(RESOURCE) \
-  thunk::RESOURCE* ResourceObjectBase::As##RESOURCE() { return NULL; }
-FOR_ALL_PPAPI_RESOURCE_APIS(DEFINE_TYPE_GETTER)
-#undef DEFINE_TYPE_GETTER
-
-}  // namespace ppapi
-