Add flag to enable immersive fullscreen for v2 apps

chrome/browser/ui/views/frame/browser_frame_ash.cc

Index: chrome/browser/ui/views/frame/browser_frame_ash.cc
diff --git a/chrome/browser/ui/views/frame/browser_frame_ash.cc b/chrome/browser/ui/views/frame/browser_frame_ash.cc
index d457dcea390a9829277841976d4dc121166a361f..5b98d0996d215c15655caa58852f6234062abd5d 100644
--- a/chrome/browser/ui/views/frame/browser_frame_ash.cc
+++ b/chrome/browser/ui/views/frame/browser_frame_ash.cc
@@ -30,12 +30,16 @@ class BrowserWindowStateDelegate : public ash::wm::WindowStateDelegate {
   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: