Add a new globals object for PPAPI tracking information.

ppapi/shared_impl/ppapi_globals.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/ppapi_globals.h"
+
+#include "base/logging.h"
+
+namespace ppapi {
+
+PpapiGlobals* PpapiGlobals::ppapi_globals_ = NULL;
+
+PpapiGlobals::PpapiGlobals() {
+  DCHECK(!ppapi_globals_);
+  ppapi_globals_ = this;
+}
+
+PpapiGlobals::~PpapiGlobals() {
+  DCHECK(ppapi_globals_ == this);
+  ppapi_globals_ = NULL;
+}
+
+}  // namespace ppapi