cros: Use runtime stylus detection for ash palette.

ash/common/ash_switches.h

Index: ash/common/ash_switches.h
diff --git a/ash/common/ash_switches.h b/ash/common/ash_switches.h
index 28f4430f9b26d4f32fd8b370e546e1cf095004f1..975bb740fb9b8ca90ed5e3d4fe9cde272439f9dc 100644
--- a/ash/common/ash_switches.h
+++ b/ash/common/ash_switches.h
@@ -25,13 +25,13 @@ ASH_EXPORT extern const char kAshDisableScreenOrientationLock[];
 ASH_EXPORT extern const char kAshDisableTouchExplorationMode[];
 ASH_EXPORT extern const char kAshEnableFullscreenAppList[];
 ASH_EXPORT extern const char kAshEnableMagnifierKeyScroller[];
-ASH_EXPORT extern const char kAshEnablePalette[];
 ASH_EXPORT extern const char kAshEnablePaletteOnAllDisplays[];
 ASH_EXPORT extern const char kAshEnableDockedWindows[];
 ASH_EXPORT extern const char kAshEnableTouchView[];
 ASH_EXPORT extern const char kAshEnableMirroredScreen[];
 ASH_EXPORT extern const char kAshDisableStableOverviewOrder[];
 ASH_EXPORT extern const char kAshEnableTouchViewTesting[];
+ASH_EXPORT extern const char kAshForceEnablePalette[];
 ASH_EXPORT extern const char kAshHideNotificationsForFactory[];
 ASH_EXPORT extern const char kAshMaterialDesign[];
 ASH_EXPORT extern const char kAshMaterialDesignDisabled[];