Add the page url to plugin crashes to aid debugging.

chrome/common/plugin_messages.h

Index: chrome/common/plugin_messages.h
===================================================================
--- chrome/common/plugin_messages.h	(revision 20181)
+++ chrome/common/plugin_messages.h	(working copy)
@@ -32,6 +32,7 @@
 struct PluginMsg_Init_Params {
   gfx::NativeViewId containing_window;
   GURL url;
+  GURL page_url;
   std::vector<std::string> arg_names;
   std::vector<std::string> arg_values;
 #if defined(OS_WIN)
@@ -109,6 +110,7 @@
   static void Write(Message* m, const param_type& p) {
     WriteParam(m, p.containing_window);
     WriteParam(m, p.url);
+    WriteParam(m, p.page_url);
     DCHECK(p.arg_names.size() == p.arg_values.size());
     WriteParam(m, p.arg_names);
     WriteParam(m, p.arg_values);
@@ -120,6 +122,7 @@
   static bool Read(const Message* m, void** iter, param_type* p) {
     return ReadParam(m, iter, &p->containing_window) &&
            ReadParam(m, iter, &p->url) &&
+           ReadParam(m, iter, &p->page_url) &&
            ReadParam(m, iter, &p->arg_names) &&
            ReadParam(m, iter, &p->arg_values) &&
 #if defined(OS_WIN)
@@ -133,6 +136,8 @@
     l->append(L", ");
     LogParam(p.url, l);
     l->append(L", ");
+    LogParam(p.page_url, l);
+    l->append(L", ");
     LogParam(p.arg_names, l);
     l->append(L", ");
     LogParam(p.arg_values, l);