Introduce the MaskedViewTargeter class

ui/views/view_targeter.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/views/view_targeter.h"
 
 #include "ui/events/event_target.h"
 #include "ui/views/focus/focus_manager.h"
 #include "ui/views/view.h"
 
 namespace views {
 
 ViewTargeter::ViewTargeter() {}
 ViewTargeter::~ViewTargeter() {}
 
+gfx::RectF ViewTargeter::BoundsForEvent(const ui::LocatedEvent& event) const {
+  gfx::RectF event_bounds(event.location_f(), gfx::SizeF(1, 1));
+  if (event.IsGestureEvent()) {
+    const ui::GestureEvent& gesture =
+        static_cast<const ui::GestureEvent&>(event);
+    event_bounds = gesture.details().bounding_box_f();
+  }
+
+  return event_bounds;
+}
+
 ui::EventTarget* ViewTargeter::FindTargetForEvent(ui::EventTarget* root,
                                                   ui::Event* event) {
   View* view = static_cast<View*>(root);
   if (event->IsKeyEvent())
     return FindTargetForKeyEvent(view, *static_cast<ui::KeyEvent*>(event));
   else if (event->IsScrollEvent())
     return EventTargeter::FindTargetForEvent(root, event);
 
   NOTREACHED() << "ViewTargeter does not yet support this event type.";
   return NULL;
@@ skipping 29 matching lines @@
   return view->HitTestRect(rect_in_view_coords);
 }
 
 View* ViewTargeter::FindTargetForKeyEvent(View* view, const ui::KeyEvent& key) {
   if (view->GetFocusManager())
     return view->GetFocusManager()->GetFocusedView();
   return NULL;
 }
 
 }  // namespace aura