Add flag to enable immersive fullscreen for v2 apps

ash/wm/caption_buttons/frame_caption_button_container_view.cc

 // Copyright 2013 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 "ash/wm/caption_buttons/frame_caption_button_container_view.h"
 
 #include "ash/ash_switches.h"
 #include "ash/shell.h"
 #include "ash/shell_delegate.h"
 #include "ash/wm/caption_buttons/alternate_frame_caption_button.h"
@@ skipping 96 matching lines @@
       l10n_util::GetStringUTF16(IDS_APP_ACCNAME_CLOSE));
   AddChildView(close_button_);
 
   button_separator_ = ui::ResourceBundle::GetSharedInstance().GetImageNamed(
       IDR_AURA_WINDOW_BUTTON_SEPARATOR).AsImageSkia();
 }
 
 FrameCaptionButtonContainerView::~FrameCaptionButtonContainerView() {
 }
 
+FrameMaximizeButton*
+FrameCaptionButtonContainerView::GetOldStyleSizeButton() {
+  return switches::UseAlternateFrameCaptionButtonStyle() ?
+      NULL : static_cast<FrameMaximizeButton*>(size_button_);
+}
+
 void FrameCaptionButtonContainerView::ResetWindowControls() {
   minimize_button_->SetState(views::CustomButton::STATE_NORMAL);
   size_button_->SetState(views::CustomButton::STATE_NORMAL);
 }
 
 int FrameCaptionButtonContainerView::NonClientHitTest(
     const gfx::Point& point) const {
   if (close_button_->visible() &&
       ConvertPointToViewAndHitTest(this, close_button_, point)) {
     return HTCLOSE;
@@ skipping 219 matching lines @@
   ui::ResourceBundle& resource_bundle = ui::ResourceBundle::GetSharedInstance();
   image_button->SetImage(views::CustomButton::STATE_NORMAL,
                          resource_bundle.GetImageSkiaNamed(normal_image_id));
   image_button->SetImage(views::CustomButton::STATE_HOVERED,
                          resource_bundle.GetImageSkiaNamed(hot_image_id));
   image_button->SetImage(views::CustomButton::STATE_PRESSED,
                          resource_bundle.GetImageSkiaNamed(pushed_image_id));
 }
 
 }  // namespace ash