Move DIP translation from ui/aura to ui/compositor

ui/gfx/compositor/compositor_switches.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/compositor/compositor_switches.h"
 
 namespace switches {
 
 const char kDisableTestCompositor[] = "disable-test-compositor";
 
 const char kDisableUIVsync[] = "disable-ui-vsync";
 
+// Enable Density Independent Pixel coordinates.
+const char kUIEnableDIP[] = "ui-enable-dip";
+
 const char kUIEnablePartialSwap[] = "ui-enable-partial-swap";
 
 // Show FPS counter.
 const char kUIShowFPSCounter[] = "ui-show-fps-counter";
 
 // Show colored borders around layers.
 const char kUIShowLayerBorders[] = "ui-show-layer-borders";
 
 // Show layer tree.
 const char kUIShowLayerTree[] = "ui-show-layer-tree";
 
 const char kUIEnablePerTilePainting[] = "ui-enable-per-tile-painting";
 
 }  // namespace switches