Get event targetting working for mouse events.

mojo/services/window_manager/view_targeter.h

Index: mojo/services/window_manager/view_targeter.h
diff --git a/mojo/services/window_manager/view_targeter.h b/mojo/services/window_manager/view_targeter.h
index 2454fb5f741ff46aab12222fcd6fcdc0ecf0fafe..250886d8e045e75811c11cedc69c05ecbfacacef 100644
--- a/mojo/services/window_manager/view_targeter.h
+++ b/mojo/services/window_manager/view_targeter.h
@@ -9,12 +9,30 @@
 
 namespace mojo {
 
+class ViewTarget;
+
 class ViewTargeter : public ui::EventTargeter {
  public:
   ViewTargeter();
   ~ViewTargeter() override;
 
+ protected:
+  // ui::EventTargeter:
+  ui::EventTarget* FindTargetForEvent(ui::EventTarget* root,
+                                      ui::Event* event) override;
+  ui::EventTarget* FindTargetForLocatedEvent(ui::EventTarget* root,
+                                             ui::LocatedEvent* event) override;
+  bool SubtreeCanAcceptEvent(ui::EventTarget* target,
+                             const ui::LocatedEvent& event) const override;
+  bool EventLocationInsideBounds(ui::EventTarget* target,
+                                 const ui::LocatedEvent& event) const override;
+
  private:
+  // Deals with cases where the |root_view| needs to change how things are
+  // dispatched. (For example, in the case of capture.)
+  ViewTarget* FindTargetInRootView(ViewTarget* root_view,
+                                   const ui::LocatedEvent& event);
+
   DISALLOW_COPY_AND_ASSIGN(ViewTargeter);
 };