Move DIP translation from ui/aura to ui/compositor

ui/gfx/compositor/dip_util.h

Index: ui/gfx/compositor/dip_util.h
diff --git a/ui/gfx/compositor/dip_util.h b/ui/gfx/compositor/dip_util.h
new file mode 100644
index 0000000000000000000000000000000000000000..d12075ad0e0b84035b184bcb1efc6ad6fc4554bc
--- /dev/null
+++ b/ui/gfx/compositor/dip_util.h
@@ -0,0 +1,47 @@
+// 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_GFX_COMPOSITOR_DIP_UTIL_H_
+#define UI_GFX_COMPOSITOR_DIP_UTIL_H_
+#pragma once
+
+#include "ui/gfx/compositor/compositor_export.h"
+
+namespace gfx {
+class Point;
+class Size;
+class Rect;
+}  // namespace gfx
+
+namespace ui {
+class Layer;
+
+COMPOSITOR_EXPORT bool IsDIPEnabled();
+
+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::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);
+
+}  // namespace ui
+
+#endif  // UI_GFX_COMPOSITOR_DIP_UTIL_H_