Make panels turn on or off shadow effect.

chrome/browser/ui/panels/native_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_NATIVE_PANEL_H_
 #define CHROME_BROWSER_UI_PANELS_NATIVE_PANEL_H_
 
 #include "chrome/browser/ui/panels/panel.h"
 #include "chrome/browser/ui/panels/panel_constants.h"
 #include "ui/gfx/native_widget_types.h"
@@ skipping 70 matching lines @@
   // Sets how the panel window displays its 4 corners, rounded or not.
   virtual void SetWindowCornerStyle(panel::CornerStyle corner_style) = 0;
 
   // Performs the system minimize for the panel, i.e. becoming iconic.
   virtual void MinimizePanelBySystem() = 0;
 
   // Returns true if the panel has been minimized by the system, i.e. becoming
   // iconic.
   virtual bool IsPanelMinimizedBySystem() const = 0;
 
+  // Turns on/off the shadow effect around the window shape.
+  virtual void ShowShadow(bool show) = 0;
+
   // Create testing interface for native panel. (Keep this last to separate
   // it from regular API.)
   virtual NativePanelTesting* CreateNativePanelTesting() = 0;
 };
 
 // A NativePanel utility interface used for accessing elements of the
 // native panel used only by test automation.
 class NativePanelTesting {
  public:
   virtual ~NativePanelTesting() {}
@@ skipping 28 matching lines @@
   virtual bool VerifySystemMinimizeState() const = 0;
 
   virtual bool IsWindowSizeKnown() const = 0;
   virtual bool IsAnimatingBounds() const = 0;
   virtual bool IsButtonVisible(panel::TitlebarButtonType button_type) const = 0;
 
   virtual panel::CornerStyle GetWindowCornerStyle() const = 0;
 };
 
 #endif  // CHROME_BROWSER_UI_PANELS_NATIVE_PANEL_H_