Factor out the layout code from OpaqueBrowserFrameView for testing.

ui/views/controls/button/image_button.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 UI_VIEWS_CONTROLS_BUTTON_IMAGE_BUTTON_H_
 #define UI_VIEWS_CONTROLS_BUTTON_IMAGE_BUTTON_H_
 
 #include "base/gtest_prod_util.h"
 #include "base/memory/scoped_ptr.h"
 #include "ui/gfx/image/image_skia.h"
 #include "ui/views/controls/button/custom_button.h"
 
 namespace views {
 
 // An image button.
 
 // Note that this type of button is not focusable by default and will not be
 // part of the focus chain.  Call set_focusable(true) to make it part of the
 // focus chain.
 
 class VIEWS_EXPORT ImageButton : public CustomButton {
  public:
+  static const char kViewClassName[];
+
   enum HorizontalAlignment {
     ALIGN_LEFT = 0,
     ALIGN_CENTER,
     ALIGN_RIGHT
   };
 
   enum VerticalAlignment {
     ALIGN_TOP = 0,
     ALIGN_MIDDLE,
     ALIGN_BOTTOM
@@ skipping 16 matching lines @@
   // Set an |image| to draw on top of the normal / hot / pushed image.
   // Pass NULL for no image.
   void SetOverlayImage(const gfx::ImageSkia* image);
 
   // Sets how the image is laid out within the button's bounds.
   void SetImageAlignment(HorizontalAlignment h_align,
                          VerticalAlignment v_align);
 
   // Overridden from View:
   virtual gfx::Size GetPreferredSize() OVERRIDE;
+  virtual const char* GetClassName() const OVERRIDE;
   virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE;
 
   // Sets preferred size, so it could be correctly positioned in layout even if
   // it is NULL.
   void SetPreferredSize(const gfx::Size& preferred_size) {
     preferred_size_ = preferred_size;
   }
 
  protected:
   // Returns the image to paint. This is invoked from paint and returns a value
@@ skipping 71 matching lines @@
   // The parent class's tooltip_text_ is displayed when not toggled, and
   // this one is shown when toggled.
   string16 toggled_tooltip_text_;
 
   DISALLOW_COPY_AND_ASSIGN(ToggleImageButton);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_BUTTON_IMAGE_BUTTON_H_