Add a new globals object for PPAPI tracking information.

ppapi/proxy/enter_proxy.h

Index: ppapi/proxy/enter_proxy.h
===================================================================
--- ppapi/proxy/enter_proxy.h	(revision 106515)
+++ ppapi/proxy/enter_proxy.h	(working copy)
@@ -9,6 +9,7 @@
 #include "ppapi/cpp/completion_callback.h"
 #include "ppapi/proxy/host_dispatcher.h"
 #include "ppapi/proxy/plugin_dispatcher.h"
+#include "ppapi/proxy/plugin_globals.h"
 #include "ppapi/proxy/plugin_resource_tracker.h"
 #include "ppapi/thunk/enter.h"
 
@@ -32,8 +33,8 @@
  public:
   EnterPluginFromHostResource(const HostResource& host_resource)
       : thunk::EnterResourceNoLock<ResourceT>(
-            PluginResourceTracker::GetInstance()->PluginResourceForHostResource(
-                host_resource),
+            PluginGlobals::Get()->plugin_resource_tracker()->
+                PluginResourceForHostResource(host_resource),
             false) {
     // Validate that we're in the plugin rather than the host. Otherwise this
     // object will do the wrong thing. In the plugin, the instance should have