Get the default device scale factor from monitor

ui/gfx/screen_android.cc

 // Copyright (c) 2012 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/gfx/screen.h"
 
 #include "base/logging.h"
 #include "ui/gfx/monitor.h"
 
 namespace gfx {
 
 // static
 gfx::Monitor Screen::GetPrimaryMonitor() {
   NOTIMPLEMENTED() << "crbug.com/117839 tracks implementation";
   return gfx::Monitor(0, gfx::Rect(0, 0, 1, 1));
 }
 
 // static
+gfx::Monitor Screen::GetMonitorNearestWindow(gfx::NativeView view) {
+  return GetPrimaryMonitor();
+}
+
+// static
 int Screen::GetNumMonitors() {
   return 1;
 }
 
 }  // namespace gfx