First pass at making the proxy handle multiple renderers. This associates the...

ppapi/proxy/ppb_url_loader_proxy.h

Index: ppapi/proxy/ppb_url_loader_proxy.h
===================================================================
--- ppapi/proxy/ppb_url_loader_proxy.h	(revision 71973)
+++ ppapi/proxy/ppb_url_loader_proxy.h	(working copy)
@@ -30,7 +30,8 @@
   // they are also provided to PPP_Instance.OnMsgHandleDocumentLoad. This
   // function allows the proxy for DocumentLoad to create the correct plugin
   // proxied info for the given browser-supplied URLLoader resource ID.
-  static void TrackPluginResource(PP_Resource url_loader_resource);
+  static void TrackPluginResource(PP_Instance instance,
+                                  PP_Resource url_loader_resource);
 
   const PPB_URLLoader* ppb_url_loader_target() const {
     return reinterpret_cast<const PPB_URLLoader*>(target_interface());