Factor out the layout code from OpaqueBrowserFrameView for testing.

ui/views/controls/button/image_button.cc

 // 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.
 
 #include "ui/views/controls/button/image_button.h"
 
 #include "base/strings/utf_string_conversions.h"
 #include "ui/base/accessibility/accessible_view_state.h"
 #include "ui/base/animation/throb_animation.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/image/image_skia_operations.h"
 #include "ui/views/widget/widget.h"
 
 namespace views {
 
 static const int kDefaultWidth = 16;   // Default button width if no theme.
 static const int kDefaultHeight = 14;  // Default button height if no theme.
 
+const char ImageButton::kViewClassName[] = "ImageButton";
+
 ////////////////////////////////////////////////////////////////////////////////
 // ImageButton, public:
 
 ImageButton::ImageButton(ButtonListener* listener)
     : CustomButton(listener),
       h_alignment_(ALIGN_LEFT),
       v_alignment_(ALIGN_TOP),
       preferred_size_(kDefaultWidth, kDefaultHeight) {
   // By default, we request that the gfx::Canvas passed to our View::OnPaint()
   // implementation is flipped horizontally so that the button's images are
@@ skipping 48 matching lines @@
   if (!images_[STATE_NORMAL].isNull()) {
     size = gfx::Size(images_[STATE_NORMAL].width(),
                      images_[STATE_NORMAL].height());
   }
 
   gfx::Insets insets = GetInsets();
   size.Enlarge(insets.width(), insets.height());
   return size;
 }
 
+const char* ImageButton::GetClassName() const {
+  return kViewClassName;
+}
+
 void ImageButton::OnPaint(gfx::Canvas* canvas) {
   // Call the base class first to paint any background/borders.
   View::OnPaint(canvas);
 
   gfx::ImageSkia img = GetImageToPaint();
 
   if (!img.isNull()) {
     gfx::Point position = ComputeImagePaintPosition(img);
     if (!background_image_.isNull())
       canvas->DrawImageInt(background_image_, position.x(), position.y());
@@ skipping 118 matching lines @@
   *tooltip = toggled_tooltip_text_;
   return true;
 }
 
 void ToggleImageButton::GetAccessibleState(ui::AccessibleViewState* state) {
   ImageButton::GetAccessibleState(state);
   GetTooltipText(gfx::Point(), &state->name);
 }
 
 }  // namespace views