Add a bunch of CHECKs to RenderViewHost trying to track down a crash.

chrome/browser/renderer_host/render_view_host.h

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_H_
 #define CHROME_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_H_
 
 #include <string>
 #include <vector>
 
 #include "base/scoped_ptr.h"
 #include "chrome/browser/extensions/extension_function_dispatcher.h"
 #include "chrome/browser/renderer_host/render_view_host_delegate.h"
 #include "chrome/browser/renderer_host/render_widget_host.h"
 #include "chrome/common/modal_dialog_event.h"
+#include "chrome/common/notification_registrar.h"
 #include "chrome/common/page_zoom.h"
 #include "webkit/api/public/WebConsoleMessage.h"
 #include "webkit/glue/autofill_form.h"
 #include "webkit/glue/password_form_dom_manager.h"
 #include "webkit/glue/window_open_disposition.h"
 
 class RenderViewHostDelegate;
 class SiteInstance;
 class SkBitmap;
 class ViewMsg_Navigate;
@@ skipping 40 matching lines @@
 //  contain things that are not relevant to a common subset of views. See also
 //  the comment in render_view_host_delegate.h about the size and scope of the
 //  delegate API.
 //
 //  Right now, the concept of page navigation (both top level and frame) exists
 //  in the TabContents still, so if you instantiate one of these elsewhere, you
 //  will not be able to traverse pages back and forward. We need to determine
 //  if we want to bring that and other functionality down into this object so
 //  it can be shared by others.
 //
-class RenderViewHost : public RenderWidgetHost {
+class RenderViewHost : public RenderWidgetHost,
+                       public NotificationObserver {
  public:
   // Returns the RenderViewHost given its ID and the ID of its render process.
   // Returns NULL if the IDs do not correspond to a live RenderViewHost.
   static RenderViewHost* FromID(int render_process_id, int render_view_id);
 
   // routing_id could be a valid route id, or it could be MSG_ROUTING_NONE, in
   // which case RenderWidgetHost will create a new one.  modal_dialog_event is
   // the event that's set when showing a modal dialog so that the renderer and
   // plugin processes know to pump messages.  An existing event can be passed
   // in, otherwise if it's NULL a new event will be created.
@@ skipping 443 matching lines @@
                           int request_id, bool has_callback);
   void OnExtensionPostMessage(int port_id, const std::string& message);
   void OnAccessibilityFocusChange(int acc_obj_id);
   void OnCSSInserted();
 
  private:
   friend class TestRenderViewHost;
 
   void UpdateBackForwardListCount();
 
+  // NotificationObserver implementation.
+  void Observe(NotificationType type,
+               const NotificationSource& source,
+               const NotificationDetails& details);
+
   // The SiteInstance associated with this RenderViewHost.  All pages drawn
   // in this RenderViewHost are part of this SiteInstance.  Should not change
   // over time.
   scoped_refptr<SiteInstance> instance_;
 
   // Our delegate, which wants to know about changes in the RenderView.
   RenderViewHostDelegate* delegate_;
 
   // true if we are currently waiting for a response for drag context
   // information.
@@ skipping 35 matching lines @@
   // must return to the renderer to unblock it.
   IPC::Message* run_modal_reply_msg_;
 
   bool is_waiting_for_unload_ack_;
 
   bool are_javascript_messages_suppressed_;
 
   // True if the render view can be shut down suddenly.
   bool sudden_termination_allowed_;
 
+  NotificationRegistrar registrar_;
+
   DISALLOW_COPY_AND_ASSIGN(RenderViewHost);
 };
 
 #endif  // CHROME_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_H_