Distinguish plugin disconnections from plugin crashes.

content/public/browser/web_contents_observer.h

 // Copyright (c) 2012 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 CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_OBSERVER_H_
 #define CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_OBSERVER_H_
 
+#include "base/process.h"
 #include "base/process_util.h"
 #include "content/common/content_export.h"
 #include "content/public/browser/navigation_controller.h"
 #include "content/public/common/page_transition_types.h"
 #include "content/public/common/three_d_api_types.h"
 #include "ipc/ipc_listener.h"
 #include "ipc/ipc_sender.h"
 #include "webkit/glue/window_open_disposition.h"
 
 namespace content {
@@ skipping 84 matching lines @@
                                    WindowOpenDisposition disposition,
                                    PageTransition transition,
                                    int64 source_frame_id) {}
 
   virtual void WasShown() {}
 
   virtual void AppCacheAccessed(const GURL& manifest_url,
                                 bool blocked_by_policy) {}
 
   // Notification that a plugin has crashed.
-  virtual void PluginCrashed(const FilePath& plugin_path) {}
+  // |plugin_pid| is the process ID identifying the plugin process. Note that
+  // this ID is supplied by the renderer, so should not be trusted. Besides, the
+  // corresponding process has probably died at this point. The ID may even have
+  // been reused by a new process.
+  virtual void PluginCrashed(const FilePath& plugin_path,
+                             base::ProcessId plugin_pid) {}
 
   // Notication that the given plugin has hung or become unhung. This
   // notification is only for Pepper plugins.
   //
   // The plugin_child_id is the unique child process ID from the plugin. Note
   // that this ID is supplied by the renderer, so should be validated before
   // it's used for anything in case there's an exploited renderer.
   virtual void PluginHungStatusChanged(int plugin_child_id,
                                        const FilePath& plugin_path,
                                        bool is_hung) {}
@@ skipping 52 matching lines @@
   void WebContentsImplDestroyed();
 
   WebContentsImpl* web_contents_;
 
   DISALLOW_COPY_AND_ASSIGN(WebContentsObserver);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_OBSERVER_H_