Unify var tracking between webkit and the proxy.

ppapi/proxy/proxy_object_var.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/proxy/proxy_object_var.h"
+
+#include "base/logging.h"
+#include "ppapi/c/pp_var.h"
+
+using pp::proxy::PluginDispatcher;
+
+namespace ppapi {
+
+ProxyObjectVar::ProxyObjectVar(PluginDispatcher* dispatcher,
+                               int32 host_var_id)
+    : Var(0),
+      dispatcher_(dispatcher),
+      host_var_id_(host_var_id) {
+  // Should be given valid objects or we'll crash later.
+  DCHECK(dispatcher_);
+  DCHECK(host_var_id_);
+}
+
+ProxyObjectVar::~ProxyObjectVar() {
+}
+
+ProxyObjectVar* ProxyObjectVar::AsProxyObjectVar() {
+  return this;
+}
+
+PP_Var ProxyObjectVar::GetPPVar() {
+  int32 id = GetOrCreateVarID();
+  if (!id)
+    return PP_MakeNull();
+
+  PP_Var result;
+  result.type = PP_VARTYPE_OBJECT;
+  result.value.as_id = id;
+  return result;
+}
+
+PP_VarType ProxyObjectVar::GetType() const {
+  return PP_VARTYPE_OBJECT;
+}
+
+void ProxyObjectVar::AssignVarID(int32 id) {
+  return Var::AssignVarID(id);
+}
+
+}  // namespace ppapi