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 +163,17 @@
   struct PP_Var (*GetPluginInstanceURL)(
       PP_Instance instance,
       struct PP_URLComponents_Dev* components);
+  /*
+   * Returns the Referer URL of the HTTP request that loaded the plugin. This is
+   * the value of the 'Referer' header of the request. An undefined value means
+   * the 'Referer' header was 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;