Relanding this with fixes to the mac dbg builder

webkit/plugins/ppapi/resource_helper.h

Index: webkit/plugins/ppapi/resource_helper.h
===================================================================
--- webkit/plugins/ppapi/resource_helper.h	(revision 118405)
+++ webkit/plugins/ppapi/resource_helper.h	(working copy)
@@ -6,6 +6,7 @@
 #define WEBKIT_PLUGINS_PPAPI_RESOURCE_HELPER_H_
 
 #include "base/basictypes.h"
+#include "ppapi/c/pp_instance.h"
 #include "ppapi/c/pp_resource.h"
 #include "webkit/plugins/webkit_plugins_export.h"
 
@@ -40,6 +41,9 @@
   // resource has outlived its instance.
   static PluginDelegate* GetPluginDelegate(const ::ppapi::Resource* resource);
 
+  // Returns the instance implementation object for the pp_instance.
+  static PluginInstance* PPInstanceToPluginInstance(PP_Instance instance);
+
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(ResourceHelper);
 };