cros/ash: Only show the stylus palette on the internal display.

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 dd7d1db018e02adad737a94f7bde37b0d474e02a..f9fde489865b74bcd15e37a8e7b614fac97e6236 100644
--- a/ash/common/system/chromeos/palette/palette_utils.h
+++ b/ash/common/system/chromeos/palette/palette_utils.h
@@ -16,6 +16,9 @@ ASH_EXPORT bool IsPaletteFeatureEnabled();
 // Are experimental palette features enabled?
 ASH_EXPORT bool ArePaletteExperimentalFeaturesEnabled();
 
+// Returns true if the palette should be shown on every display.
+ASH_EXPORT bool IsPaletteEnabledOnEveryDisplay();
+
 }  // namespace ash
 
 #endif  // ASH_COMMON_SYSTEM_CHROMEOS_PALETTE_PALETTE_UTILS_H_