Change Panel titlebars to activate the panel on click (rather than minimize).

chrome/browser/ui/panels/panel.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 CHROME_BROWSER_UI_PANELS_PANEL_H_
 #define CHROME_BROWSER_UI_PANELS_PANEL_H_
 #pragma once
 
 #include "chrome/browser/ui/browser_window.h"
 
@@ skipping 277 matching lines @@
   void SetPreviewMode(bool in_preview_mode);
 
   // Sets up the panel for being resizable by the user - for example,
   // enables the resize mouse cursors when mouse is hovering over the edges.
   void EnableResizeByMouse(bool enable);
 
   // Changes the preferred size to acceptable based on min_size() and max_size()
   void ClampSize(gfx::Size* size) const;
 
   // Called when the panel's active state changes.
-  void OnActiveStateChanged();
+  // |active| is true if panel became active.
+  void OnActiveStateChanged(bool active);
 
  protected:
   virtual void DestroyBrowser() OVERRIDE;
 
  private:
   friend class PanelManager;
   friend class PanelBrowserTest;
   FRIEND_TEST_ALL_PREFIXES(PanelBrowserTest, RestoredBounds);
 
   // Panel can only be created using PanelManager::CreatePanel().
@@ skipping 46 matching lines @@
   AttentionMode attention_mode_;
 
   ExpansionState expansion_state_;
 
   content::NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(Panel);
 };
 
 #endif  // CHROME_BROWSER_UI_PANELS_PANEL_H_