Move histograms and supporting code that don't belong in content out.

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"
@@ skipping 241 matching lines @@
   // Invoked when visible SSL state (as defined by SSLStatus) changes.
   virtual void DidChangeVisibleSSLState() {}
 
   // Invoked when an interstitial page is attached or detached.
   virtual void DidAttachInterstitialPage() {}
   virtual void DidDetachInterstitialPage() {}
 
   // Invoked before a form repost warning is shown.
   virtual void BeforeFormRepostWarningShow() {}
 
+  // Invoked when the before unload fires. The time is from the renderer.
+  virtual void BeforeUnloadFired(const base::TimeTicks& proceed_time) {}
+
+  // Invoked when a user cancels a before unload dialog.
+  virtual void BeforeUnloadDialogCancelled() {}
+
   // IPC::Listener implementation.
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
 
   // IPC::Sender implementation.
   virtual bool Send(IPC::Message* message) OVERRIDE;
   int routing_id() const;
 
  protected:
   // Use this constructor when the object is tied to a single WebContents for
   // its entire lifetime.
@@ skipping 19 matching lines @@
   void WebContentsImplDestroyed();
 
   WebContentsImpl* web_contents_;
 
   DISALLOW_COPY_AND_ASSIGN(WebContentsObserver);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_OBSERVER_H_