mash: Migrate ShelfTooltipManager to wm common types.

ash/aura/wm_window_aura.cc

Index: ash/aura/wm_window_aura.cc
diff --git a/ash/aura/wm_window_aura.cc b/ash/aura/wm_window_aura.cc
index f3345f9b71b796f7996e6e73f0d8c68021806c76..c34ff0bda13047eb48ab4d871919a310a73fe53a 100644
--- a/ash/aura/wm_window_aura.cc
+++ b/ash/aura/wm_window_aura.cc
@@ -662,6 +662,14 @@ bool WmWindowAura::HasObserver(const WmWindowObserver* observer) const {
   return observers_.HasObserver(observer);
 }
 
+void WmWindowAura::AddLimitedPreTargetHandler(ui::EventHandler* handler) {
+  window_->AddPreTargetHandler(handler);

[sky, 2016/07/26 13:25:20]

This will give different semantics than the mus side, but as long there are no
child windows it shouldn't matter. Maybe a comment here?

[msw, 2016/07/26 17:43:25]

Added a vague comment, let me know if you have something better in mind.

+}
+
+void WmWindowAura::RemoveLimitedPreTargetHandler(ui::EventHandler* handler) {
+  window_->RemovePreTargetHandler(handler);
+}
+
 void WmWindowAura::OnWindowHierarchyChanging(
     const HierarchyChangeParams& params) {
   WmWindowObserver::TreeChangeParams wm_params;