Proxy PPB_Var, fix o-o-p string var id tracking.

ppapi/proxy/ppb_var_proxy.cc

Index: ppapi/proxy/ppb_var_proxy.cc
diff --git a/ppapi/proxy/ppb_var_proxy.cc b/ppapi/proxy/ppb_var_proxy.cc
new file mode 100644
index 0000000000000000000000000000000000000000..063d4d3437b70251989159a168e71191852f99d1
--- /dev/null
+++ b/ppapi/proxy/ppb_var_proxy.cc
@@ -0,0 +1,85 @@
+// 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/ppb_var_proxy.h"
+
+#include "ppapi/c/pp_var.h"
+#include "ppapi/c/ppb_var.h"
+#include "ppapi/proxy/plugin_var_tracker.h"
+
+namespace pp {
+namespace proxy {
+
+namespace {
+
+// PPP_Var plugin --------------------------------------------------------------
+
+void AddRefVar(PP_Var var) {
+  PluginVarTracker::GetInstance()->AddRef(var);
+}
+
+void ReleaseVar(PP_Var var) {
+  PluginVarTracker::GetInstance()->Release(var);
+}
+
+PP_Var VarFromUtf8(PP_Module module, const char* data, uint32_t len) {
+  PP_Var ret = {};
+  ret.type = PP_VARTYPE_STRING;
+  ret.value.as_id = PluginVarTracker::GetInstance()->MakeString(data, len);
+  return ret;
+}
+
+const char* VarToUtf8(PP_Var var, uint32_t* len) {
+  const std::string* str =
+      PluginVarTracker::GetInstance()->GetExistingString(var);
+  if (str) {
+    *len = static_cast<uint32_t>(str->size());
+    return str->c_str();
+  }
+  *len = 0;
+  return NULL;
+}
+
+const PPB_Var var_interface = {
+  &AddRefVar,
+  &ReleaseVar,
+  &VarFromUtf8,
+  &VarToUtf8
+};
+
+InterfaceProxy* CreateVarProxy(Dispatcher* dispatcher,
+                               const void* target_interface) {
+  return new PPB_Var_Proxy(dispatcher, target_interface);
+}
+
+}  // namespace
+
+PPB_Var_Proxy::PPB_Var_Proxy(Dispatcher* dispatcher,
+                             const void* target_interface)
+    : InterfaceProxy(dispatcher, target_interface) {
+}
+
+PPB_Var_Proxy::~PPB_Var_Proxy() {
+}
+
+// static
+const InterfaceProxy::Info* PPB_Var_Proxy::GetInfo() {
+  static const Info info = {
+    &var_interface,
+    PPB_VAR_INTERFACE,
+    INTERFACE_ID_PPB_VAR,
+    false,
+    &CreateVarProxy,
+  };
+  return &info;
+}
+
+bool PPB_Var_Proxy::OnMessageReceived(const IPC::Message& msg) {
+  // All PPB_Var calls are handled locally; there is no need to send or receive
+  // messages here.
+  return false;
+}
+
+}  // namespace proxy
+}  // namespace pp