Trivial plumbing of some methods from DesktopNativeWidgetAura to DesktopRootWindowHost.

ui/views/widget/desktop_native_widget_aura.cc

Index: ui/views/widget/desktop_native_widget_aura.cc
===================================================================
--- ui/views/widget/desktop_native_widget_aura.cc	(revision 157638)
+++ ui/views/widget/desktop_native_widget_aura.cc	(working copy)
@@ -269,19 +269,22 @@
 }
 
 void DesktopNativeWidgetAura::SetFullscreen(bool fullscreen) {
+  desktop_root_window_host_->SetFullscreen(fullscreen);
 }
 
 bool DesktopNativeWidgetAura::IsFullscreen() const {
-  return false;
+  return desktop_root_window_host_->IsFullscreen();
 }
 
 void DesktopNativeWidgetAura::SetOpacity(unsigned char opacity) {
+  desktop_root_window_host_->SetOpacity(opacity);
 }
 
 void DesktopNativeWidgetAura::SetUseDragFrame(bool use_drag_frame) {
 }
 
 void DesktopNativeWidgetAura::FlashFrame(bool flash_frame) {
+  desktop_root_window_host_->FlashFrame(flash_frame);
 }
 
 bool DesktopNativeWidgetAura::IsAccessibleWidget() const {