View source after POST command isn't what you expected.

chrome/browser/tab_contents/tab_contents_delegate.h

 // Copyright (c) 2010 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_TAB_CONTENTS_TAB_CONTENTS_DELEGATE_H_
 #define CHROME_BROWSER_TAB_CONTENTS_TAB_CONTENTS_DELEGATE_H_
 #pragma once
 
 #include <string>
 #include <vector>
@@ skipping 231 matching lines @@
 
   // Shows the page info using the specified information.
   // |url| is the url of the page/frame the info applies to, |ssl| is the SSL
   // information for that page/frame.  If |show_history| is true, a section
   // showing how many times that URL has been visited is added to the page info.
   virtual void ShowPageInfo(Profile* profile,
                             const GURL& url,
                             const NavigationEntry::SSLStatus& ssl,
                             bool show_history);
 
+  // Opens source view for given tab contents.
+  virtual void ViewSourceForTab(TabContents* source);
+
   // Allows delegates to handle keyboard events before sending to the renderer.
   // Returns true if the |event| was handled. Otherwise, if the |event| would be
   // handled in HandleKeyboardEvent() method as a normal keyboard shortcut,
   // |*is_keyboard_shortcut| should be set to true.
   virtual bool PreHandleKeyboardEvent(const NativeWebKeyboardEvent& event,
                                       bool* is_keyboard_shortcut);
 
   // Allows delegates to handle unhandled keyboard messages coming back from
   // the renderer.
   virtual void HandleKeyboardEvent(const NativeWebKeyboardEvent& event);
@@ skipping 57 matching lines @@
 
   // Notifies the delegate that the content restrictions for this tab has
   // changed.
   virtual void ContentRestrictionsChanged(TabContents* source);
 
  protected:
   virtual ~TabContentsDelegate();
 };
 
 #endif  // CHROME_BROWSER_TAB_CONTENTS_TAB_CONTENTS_DELEGATE_H_