Add the page url to plugin crashes to aid debugging.

chrome/renderer/webplugin_delegate_proxy.h

Index: chrome/renderer/webplugin_delegate_proxy.h
===================================================================
--- chrome/renderer/webplugin_delegate_proxy.h	(revision 20098)
+++ chrome/renderer/webplugin_delegate_proxy.h	(working copy)
@@ -14,11 +14,11 @@
 #include "base/ref_counted.h"
 #include "chrome/common/ipc_message.h"
 #include "chrome/renderer/plugin_channel_host.h"
+#include "googleurl/src/gurl.h"
 #include "skia/ext/platform_canvas.h"
 #include "webkit/glue/webplugin.h"
 #include "webkit/glue/webplugin_delegate.h"
 
-class GURL;
 struct NPObject;
 class NPObjectStub;
 struct NPVariant_Param;
@@ -204,6 +204,9 @@
   // This lets us know which portion of the backing store has been painted into.
   gfx::Rect backing_store_painted_;
 
+  // The url of the main frame hosting the plugin.
+  GURL page_url_;
+
   DISALLOW_EVIL_CONSTRUCTORS(WebPluginDelegateProxy);
 };