Fix stylus tools palette.

ash/system/palette/palette_utils.h

 // Copyright 2016 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 ASH_SYSTEM_PALETTE_PALETTE_UTILS_H_
 #define ASH_SYSTEM_PALETTE_PALETTE_UTILS_H_
 
 #include "ash/ash_export.h"
 
 namespace gfx {
 class Point;
 }
 
 namespace ash {
 namespace palette_utils {
 
-// Returns true if there is a stylus input device on the internal display. This
-// will return false even if there is a stylus input device until hardware
-// probing is complete (see ui::InputDeviceEventObserver).
+// Returns true if there is a stylus input device on the internal display.

[jdufault, 2017/04/26 18:50:43]

Revert this change?

[wutao, 2017/04/26 22:01:50]

Done.

 ASH_EXPORT bool HasStylusInput();

[jdufault, 2017/04/26 18:50:43]

Does this still need to be in the header?

[wutao, 2017/04/26 22:01:50]

Yes. There are multiple sites calling this.

 
 // Returns true if the palette should be shown on every display.
 ASH_EXPORT bool IsPaletteEnabledOnEveryDisplay();
 
+// Returns true if we should show palette.

[jdufault, 2017/04/26 18:50:42]

Can you be a bit more detailed in this comment, ie, what is the difference
between ShouldShowPalette and HasStylusInput?

[wutao, 2017/04/26 22:01:50]

Done.

+ASH_EXPORT bool ShouldShowPalette();
+
 // Returns true if either the palette icon or the palette widget contain the
 // given point (in screen space).
 ASH_EXPORT bool PaletteContainsPointInScreen(const gfx::Point& point);
 
 }  // namespace palette_utils
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_PALETTE_PALETTE_UTILS_H_