It is time.

ui/compositor/dip_util.h

-// 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.
-
-#ifndef UI_COMPOSITOR_DIP_UTIL_H_
-#define UI_COMPOSITOR_DIP_UTIL_H_
-
-#include "ui/compositor/compositor_export.h"
-#include "base/basictypes.h"
-#include "ui/gfx/point_f.h"
-
-namespace gfx {
-class Point;
-class Size;
-class Rect;
-}  // namespace gfx
-
-namespace ui {
-class Layer;
-
-COMPOSITOR_EXPORT float GetDeviceScaleFactor(const Layer* layer);
-
-// Utility functions that convert point/size/rect between
-// DIP and pixel coordinates system.
-COMPOSITOR_EXPORT gfx::Point ConvertPointToDIP(
-    const Layer* layer,
-    const gfx::Point& point_in_pixel);
-COMPOSITOR_EXPORT gfx::PointF ConvertPointToDIP(
-    const Layer* layer,
-    const gfx::PointF& point_in_pixel);
-COMPOSITOR_EXPORT gfx::Size ConvertSizeToDIP(
-    const Layer* layer,
-    const gfx::Size& size_in_pixel);
-COMPOSITOR_EXPORT gfx::Rect ConvertRectToDIP(
-    const Layer* layer,
-    const gfx::Rect& rect_in_pixel);
-COMPOSITOR_EXPORT gfx::Point ConvertPointToPixel(
-    const Layer* layer,
-    const gfx::Point& point_in_dip);
-COMPOSITOR_EXPORT gfx::Size ConvertSizeToPixel(
-    const Layer* layer,
-    const gfx::Size& size_in_dip);
-COMPOSITOR_EXPORT gfx::Rect ConvertRectToPixel(
-    const Layer* layer,
-    const gfx::Rect& rect_in_dip);
-
-// Snaps the |layer_to_snap| to the physical pixel boundary.
-// |snapped_layer| is a reference layer that should also be
-// snapped at the pysical pixel boundary.
-COMPOSITOR_EXPORT void SnapLayerToPhysicalPixelBoundary(
-    ui::Layer* snapped_layer,
-    ui::Layer* layer_to_snap);
-
-}  // namespace ui
-
-#endif  // UI_COMPOSITOR_DIP_UTIL_H_