Proxy the PPP_Printing interface

ppapi/shared_impl/resource_tracker.cc

Index: ppapi/shared_impl/resource_tracker.cc
diff --git a/ppapi/shared_impl/resource_tracker.cc b/ppapi/shared_impl/resource_tracker.cc
index 3b66db8b40b8c7d03b356f4b394706fc26c0fb20..2069c74913e69ef85d7b4918508d01e18a644fcc 100644
--- a/ppapi/shared_impl/resource_tracker.cc
+++ b/ppapi/shared_impl/resource_tracker.cc
@@ -4,6 +4,9 @@
 
 #include "ppapi/shared_impl/resource_tracker.h"
 
+#include "base/bind.h"
+#include "base/compiler_specific.h"
+#include "base/message_loop.h"
 #include "ppapi/shared_impl/callback_tracker.h"
 #include "ppapi/shared_impl/id_assignment.h"
 #include "ppapi/shared_impl/ppapi_globals.h"
@@ -11,7 +14,9 @@
 
 namespace ppapi {
 
-ResourceTracker::ResourceTracker() : last_resource_value_(0) {
+ResourceTracker::ResourceTracker()
+    : last_resource_value_(0),
+      ALLOW_THIS_IN_INITIALIZER_LIST(weak_ptr_factory_(this)) {
 }
 
 ResourceTracker::~ResourceTracker() {
@@ -67,6 +72,14 @@ void ResourceTracker::ReleaseResource(PP_Resource res) {
   }
 }
 
+void ResourceTracker::ReleaseResourceSoon(PP_Resource res) {
+  MessageLoop::current()->PostNonNestableTask(
+      FROM_HERE,
+      base::Bind(&ResourceTracker::ReleaseResource,
+             weak_ptr_factory_.GetWeakPtr(),
+             res));
+}
+
 void ResourceTracker::DidCreateInstance(PP_Instance instance) {
   // Due to the infrastructure of some tests, the instance is registered
   // twice in a few cases. It would be nice not to do that and assert here