Add GetPluginRefererURL to PPB_URLUtil_Dev interface to get the 'Referer' HTTP header value that wa…

ppapi/thunk/ppb_url_util_thunk.cc

Index: ppapi/thunk/ppb_url_util_thunk.cc
===================================================================
--- ppapi/thunk/ppb_url_util_thunk.cc	(revision 219784)
+++ ppapi/thunk/ppb_url_util_thunk.cc	(working copy)
@@ -53,6 +53,14 @@
   return enter.functions()->GetPluginInstanceURL(instance, components);
 }
 
+PP_Var GetPluginRefererURL(PP_Instance instance,
+                           PP_URLComponents_Dev* components) {
+  EnterInstance enter(instance);
+  if (enter.failed())
+    return PP_MakeUndefined();
+  return enter.functions()->GetPluginRefererURL(instance, components);
+}
+
 const PPB_URLUtil_Dev g_ppb_url_util = {
   &PPB_URLUtil_Shared::Canonicalize,
   &PPB_URLUtil_Shared::ResolveRelativeToURL,
@@ -61,7 +69,8 @@
   &DocumentCanRequest,
   &DocumentCanAccessDocument,
   &GetDocumentURL,
-  &GetPluginInstanceURL
+  &GetPluginInstanceURL,
+  &GetPluginRefererURL
 };
 
 }  // namespace