Add the page url to plugin crashes to aid debugging.

chrome/plugin/npobject_util.cc

Index: chrome/plugin/npobject_util.cc
===================================================================
--- chrome/plugin/npobject_util.cc	(revision 20181)
+++ chrome/plugin/npobject_util.cc	(working copy)
@@ -138,7 +138,8 @@
                           PluginChannelBase* channel,
                           NPVariant_Param* param,
                           bool release,
-                          base::WaitableEvent* modal_dialog_event) {
+                          base::WaitableEvent* modal_dialog_event,
+                          const GURL& page_url) {
   switch (variant.type) {
     case NPVariantType_Void:
       param->type = NPVARIANT_PARAM_VOID;
@@ -183,7 +184,8 @@
           param->type = NPVARIANT_PARAM_OBJECT_ROUTING_ID;
           int route_id = channel->GenerateRouteID();
           new NPObjectStub(
-              variant.value.objectValue, channel, route_id, modal_dialog_event);
+              variant.value.objectValue, channel, route_id, modal_dialog_event,
+              page_url);
           param->npobject_routing_id = route_id;
           param->npobject_pointer =
               reinterpret_cast<intptr_t>(variant.value.objectValue);
@@ -204,7 +206,8 @@
 void CreateNPVariant(const NPVariant_Param& param,
                      PluginChannelBase* channel,
                      NPVariant* result,
-                     base::WaitableEvent* modal_dialog_event) {
+                     base::WaitableEvent* modal_dialog_event,
+                     const GURL& page_url) {
   switch (param.type) {
     case NPVARIANT_PARAM_VOID:
       result->type = NPVariantType_Void;
@@ -237,7 +240,8 @@
           NPObjectProxy::Create(channel,
                                 param.npobject_routing_id,
                                 param.npobject_pointer,
-                                modal_dialog_event);
+                                modal_dialog_event,
+                                page_url);
       break;
     case NPVARIANT_PARAM_OBJECT_POINTER:
       result->type = NPVariantType_Object;