Add the PP_Instance to resource object base.

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