[PPAPI] ResourceVar now reference counts its PP_Resource in the plugin.

ppapi/shared_impl/var_tracker.cc

Index: ppapi/shared_impl/var_tracker.cc
diff --git a/ppapi/shared_impl/var_tracker.cc b/ppapi/shared_impl/var_tracker.cc
index 254c51ab579f3d71fefb3126be2c4c505083e5a1..bada0ab76dd137bfcb859cbe243b3adbc36446dd 100644
--- a/ppapi/shared_impl/var_tracker.cc
+++ b/ppapi/shared_impl/var_tracker.cc
@@ -13,6 +13,7 @@
 #include "ppapi/shared_impl/host_resource.h"
 #include "ppapi/shared_impl/id_assignment.h"
 #include "ppapi/shared_impl/proxy_lock.h"
+#include "ppapi/shared_impl/resource_var.h"
 #include "ppapi/shared_impl/var.h"
 
 namespace ppapi {
@@ -234,6 +235,13 @@ PP_Var VarTracker::MakeArrayBufferPPVar(uint32 size_in_bytes,
   return array_buffer->GetPPVar();
 }
 
+PP_Var VarTracker::MakeResourcePPVar(PP_Resource pp_resource) {
+  CheckThreadingPreconditions();
+
+  ResourceVar* resource_var = MakeResourceVar(pp_resource);
+  return resource_var ? resource_var->GetPPVar() : PP_MakeNull();
+}
+
 std::vector<PP_Var> VarTracker::GetLiveVars() {
   CheckThreadingPreconditions();