Make info button appear only when mouse is over the panel or the panel has focus.

chrome/browser/ui/panels/panel_browser_view.h

 // Copyright (c) 2011 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_BROWSER_VIEW_H_
 #define CHROME_BROWSER_UI_PANELS_PANEL_BROWSER_VIEW_H_
 #pragma once
 
 #include "base/gtest_prod_util.h"
 #include "chrome/browser/ui/views/frame/browser_view.h"
@@ skipping 13 matching lines @@
   // Called from frame view when title bar receives a mouse event.
   // Return true if the event is handled.
   bool OnTitleBarMousePressed(const views::MouseEvent& event);
   bool OnTitleBarMouseDragged(const views::MouseEvent& event);
   bool OnTitleBarMouseReleased(const views::MouseEvent& event);
   bool OnTitleBarMouseCaptureLost();
 
  private:
   friend class PanelBrowserViewTest;
   FRIEND_TEST_ALL_PREFIXES(PanelBrowserViewTest, CreatePanel);
+  FRIEND_TEST_ALL_PREFIXES(PanelBrowserViewTest, ShowOrHideInfoButton);
 
   // Overridden from BrowserView:
   virtual void Init() OVERRIDE;
   virtual void Close() OVERRIDE;
   virtual void UpdateTitleBar() OVERRIDE;
   virtual bool GetSavedWindowBounds(gfx::Rect* bounds) const OVERRIDE;
   virtual void OnWindowActivationChanged(bool active) OVERRIDE;
   virtual bool AcceleratorPressed(const views::Accelerator& accelerator)
       OVERRIDE;
 
   PanelBrowserFrameView* GetFrameView() const;
   bool EndDragging(bool cancelled);
 
   Panel* panel_;
 
   // Is the mouse button currently down?
   bool mouse_pressed_;
 
   // Location the mouse was pressed at. Used to detect drag and drop.
   gfx::Point mouse_pressed_point_;
 
   // Is the titlebar currently being dragged?  That is, has the cursor
   // moved more than kDragThreshold away from its starting position?
   bool mouse_dragging_;
 
   DISALLOW_COPY_AND_ASSIGN(PanelBrowserView);
 };
 
 #endif  // CHROME_BROWSER_UI_PANELS_PANEL_BROWSER_VIEW_H_