Add FakeDisplayDelegate for off device usage.

ui/display/chromeos/x11/native_display_delegate_x11.cc

 // Copyright 2014 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/display/chromeos/x11/native_display_delegate_x11.h"
 
 #include <X11/Xatom.h>
 #include <X11/Xlib.h>
 #include <X11/extensions/dpms.h>
 #include <X11/extensions/Xrandr.h>
@@ skipping 264 matching lines @@
 }
 
 void NativeDisplayDelegateX11::AddObserver(NativeDisplayObserver* observer) {
   observers_.AddObserver(observer);
 }
 
 void NativeDisplayDelegateX11::RemoveObserver(NativeDisplayObserver* observer) {
   observers_.RemoveObserver(observer);
 }
 
+display::FakeDisplayController*
+NativeDisplayDelegateX11::GetFakeDisplayController() {
+  return nullptr;
+}
+
 void NativeDisplayDelegateX11::InitModes() {
   CHECK(screen_) << "Server not grabbed";
 
   base::STLDeleteContainerPairSecondPointers(modes_.begin(), modes_.end());
   modes_.clear();
 
   for (int i = 0; i < screen_->nmode; ++i) {
     const XRRModeInfo& info = screen_->modes[i];
     float refresh_rate = 0.0f;
     if (info.hTotal && info.vTotal) {
@@ skipping 360 matching lines @@
   XSetForeground(display_, gc, color.pixel);
   XSetFillStyle(display_, gc, FillSolid);
   int width = DisplayWidth(display_, DefaultScreen(display_));
   int height = DisplayHeight(display_, DefaultScreen(display_));
   XFillRectangle(display_, window_, gc, 0, 0, width, height);
   XFreeGC(display_, gc);
   XFreeColors(display_, colormap, &color.pixel, 1, 0);
 }
 
 }  // namespace ui