cros: Use runtime stylus detection for ash palette.

ash/common/system/chromeos/palette/palette_utils.h

Index: ash/common/system/chromeos/palette/palette_utils.h
diff --git a/ash/common/system/chromeos/palette/palette_utils.h b/ash/common/system/chromeos/palette/palette_utils.h
index 06ee2ea1b648ecedef8e7ebe6461c04df68f38d0..b7da334caaa5cf4ea8f2e7b6e18d77b3dffa3715 100644
--- a/ash/common/system/chromeos/palette/palette_utils.h
+++ b/ash/common/system/chromeos/palette/palette_utils.h
@@ -13,9 +13,10 @@ class Point;
 
 namespace ash {
 
-// Returns true if the palette feature is enabled. The palette itself may have
-// been disabled by the user.
-ASH_EXPORT bool IsPaletteFeatureEnabled();
+// 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).
+ASH_EXPORT bool HasStylusInput();
 
 // Returns true if the palette should be shown on every display.
 ASH_EXPORT bool IsPaletteEnabledOnEveryDisplay();