Move Windows DPI Code from ui/gfx to ui/display

ui/gfx/win/dpi.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/win/dpi.h"
-
-#include <windows.h>
-#include "base/win/scoped_hdc.h"
-#include "ui/gfx/display.h"
-
-namespace {
-
-const float kDefaultDPI = 96.f;
-
-float g_device_scale_factor = 0.f;
-
-float GetUnforcedDeviceScaleFactor() {
-  return g_device_scale_factor ?
-      g_device_scale_factor :
-      static_cast<float>(gfx::GetDPI().width()) / kDefaultDPI;
-}
-
-}  // namespace
-
-namespace gfx {
-
-void SetDefaultDeviceScaleFactor(float scale) {
-  DCHECK_NE(0.f, scale);
-  g_device_scale_factor = scale;
-}
-
-Size GetDPI() {
-  static int dpi_x = 0;
-  static int dpi_y = 0;
-  static bool should_initialize = true;
-
-  if (should_initialize) {
-    should_initialize = false;
-    base::win::ScopedGetDC screen_dc(NULL);
-    // This value is safe to cache for the life time of the app since the
-    // user must logout to change the DPI setting. This value also applies
-    // to all screens.
-    dpi_x = GetDeviceCaps(screen_dc, LOGPIXELSX);
-    dpi_y = GetDeviceCaps(screen_dc, LOGPIXELSY);
-  }
-  return Size(dpi_x, dpi_y);
-}
-
-float GetDPIScale() {
-  if (gfx::Display::HasForceDeviceScaleFactor())
-    return gfx::Display::GetForcedDeviceScaleFactor();
-  float dpi_scale = GetUnforcedDeviceScaleFactor();
-  return (dpi_scale <= 1.25f) ? 1.f : dpi_scale;
-}
-
-namespace win {
-
-int GetSystemMetricsInDIP(int metric) {
-  // The system metrics always reflect the system DPI, not whatever scale we've
-  // forced or decided to use.
-  return static_cast<int>(
-      std::round(GetSystemMetrics(metric) / GetUnforcedDeviceScaleFactor()));
-}
-
-}  // namespace win
-}  // namespace gfx