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

ppapi/proxy/ppp_instance_proxy.cc

Index: ppapi/proxy/ppp_instance_proxy.cc
diff --git a/ppapi/proxy/ppp_instance_proxy.cc b/ppapi/proxy/ppp_instance_proxy.cc
index 05c061bef4ce7d90fceb6f07313764eab8252630..612fb772f7321c231174ebc28fea87d3b3b65416 100644
--- a/ppapi/proxy/ppp_instance_proxy.cc
+++ b/ppapi/proxy/ppp_instance_proxy.cc
@@ -165,6 +165,7 @@ void PPP_Instance_Proxy::OnMsgDidCreate(
   PluginDispatcher* plugin_dispatcher =
       static_cast<PluginDispatcher*>(dispatcher());
   plugin_dispatcher->DidCreateInstance(instance);
+  ppapi::TrackerBase::Get()->GetResourceTracker()->DidCreateInstance(instance);
 
   // Make sure the arrays always have at least one element so we can take the
   // address below.
@@ -185,6 +186,7 @@ void PPP_Instance_Proxy::OnMsgDidCreate(
 
 void PPP_Instance_Proxy::OnMsgDidDestroy(PP_Instance instance) {
   combined_interface_->DidDestroy(instance);
+  ppapi::TrackerBase::Get()->GetResourceTracker()->DidDeleteInstance(instance);
   static_cast<PluginDispatcher*>(dispatcher())->DidDestroyInstance(instance);
 }