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

ppapi/c/dev/ppb_url_util_dev.h

Index: ppapi/c/dev/ppb_url_util_dev.h
===================================================================
--- ppapi/c/dev/ppb_url_util_dev.h	(revision 219784)
+++ ppapi/c/dev/ppb_url_util_dev.h	(working copy)
@@ -163,6 +163,16 @@
   struct PP_Var (*GetPluginInstanceURL)(
       PP_Instance instance,
       struct PP_URLComponents_Dev* components);
+  /*
+   * Returns the 'Referer' HTTP header value that was sent by the request
+   * that loaded plug-in. Undefined value means 'Referer' header is absent.
+   * The components pointer, if non-NULL and the canonicalized URL is valid,
+   * will identify the components of the resulting URL. Components may be NULL
+   * to specify that no component information is necessary.
+   */
+  struct PP_Var (*GetPluginRefererURL)(
+      PP_Instance instance,
+      struct PP_URLComponents_Dev* components);
 };
 
 typedef struct PPB_URLUtil_Dev_0_6 PPB_URLUtil_Dev;