Add "stylus-tools" Wayland protocol.

ui/aura/client/aura_constants.cc

Index: ui/aura/client/aura_constants.cc
diff --git a/ui/aura/client/aura_constants.cc b/ui/aura/client/aura_constants.cc
index a3961e5fd42f6f1fc63b0752ae5ce01cd750a052..e968f68d3164ea53dbd68bdd8aa28f0d9c0dbb9d 100644
--- a/ui/aura/client/aura_constants.cc
+++ b/ui/aura/client/aura_constants.cc
@@ -61,6 +61,7 @@ DEFINE_UI_CLASS_PROPERTY_KEY(int32_t,
 DEFINE_OWNED_UI_CLASS_PROPERTY_KEY(gfx::Rect, kRestoreBoundsKey, nullptr);
 DEFINE_UI_CLASS_PROPERTY_KEY(
     ui::WindowShowState, kShowStateKey, ui::SHOW_STATE_DEFAULT);
+DEFINE_UI_CLASS_PROPERTY_KEY(bool, kStylusOnlyKey, false);
 DEFINE_OWNED_UI_CLASS_PROPERTY_KEY(base::string16, kTitleKey, nullptr);
 DEFINE_UI_CLASS_PROPERTY_KEY(int, kTopViewInset, 0);
 DEFINE_UI_CLASS_PROPERTY_KEY(SkColor, kTopViewColor, SK_ColorTRANSPARENT);