Add flag to enable immersive fullscreen for v2 apps

chrome/browser/ui/views/frame/browser_frame_ash.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 "chrome/browser/ui/views/frame/browser_frame_ash.h"
 
 #include "ash/wm/window_state.h"
 #include "ash/wm/window_state_delegate.h"
 #include "ash/wm/window_util.h"
 #include "chrome/browser/ui/browser_commands.h"
@@ skipping 12 matching lines @@
 // request (Shift+F4/F4) for browser (tabbed/popup) windows.
 class BrowserWindowStateDelegate : public ash::wm::WindowStateDelegate {
  public:
   explicit BrowserWindowStateDelegate(Browser* browser)
       : browser_(browser) {
     DCHECK(browser_);
   }
   virtual ~BrowserWindowStateDelegate(){}
 
   // Overridden from ash::wm::WindowStateDelegate.
-  virtual bool ToggleFullscreen(ash::wm::WindowState* window_state) OVERRIDE {
-    DCHECK(window_state->IsFullscreen() || window_state->CanMaximize());
-    // Windows which cannot be maximized should not be fullscreened.
-    if (!window_state->IsFullscreen() && !window_state->CanMaximize())
-      return true;
-    chrome::ToggleFullscreenMode(browser_);
+  virtual bool EnterImmersiveFullscreen(
+      ash::wm::WindowState* window_state) OVERRIDE {
+    // Immersive fullscreen is the same as browser fullscreen.
+    if (!window_state->IsFullscreen())
+      chrome::ToggleFullscreenMode(browser_);
+    return true;
+  }
+  virtual bool ExitFullscreen(ash::wm::WindowState* window_state) OVERRIDE {
+    if (window_state->IsFullscreen())
+      chrome::ToggleFullscreenMode(browser_);
     return true;
   }
  private:
   Browser* browser_;  // not owned.
 
   DISALLOW_COPY_AND_ASSIGN(BrowserWindowStateDelegate);
 };
 
 // AppNonClientFrameViewAsh shows only the window controls and no
 // other window decorations which is pretty close to fullscreen. Put
@@ skipping 171 matching lines @@
 BrowserFrameAsh::~BrowserFrameAsh() {
 }
 
 void BrowserFrameAsh::SetWindowAutoManaged() {
   if (browser_view_->browser()->type() != Browser::TYPE_POPUP ||
       browser_view_->browser()->is_app()) {
     ash::wm::GetWindowState(GetNativeWindow())->
         set_window_position_managed(true);
   }
 }