mash: changes event dispatch to consider non-client area of all windows

services/ui/ws/window_finder.h

 // Copyright 2015 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.
 
 #ifndef SERVICES_UI_WS_WINDOW_FINDER_H_
 #define SERVICES_UI_WS_WINDOW_FINDER_H_
 
 namespace gfx {
 class Point;
 class Transform;
 }
 
 namespace ui {
 namespace ws {
 
 class ServerWindow;
 
-// Find the deepest visible child of |root| that should receive an event at
-// |location|. |location| is initially in the coordinate space of
-// |root_window|, on return it is converted to the coordinates of the return
-// value. Returns null if there is no valid event target window over |location|.
-ServerWindow* FindDeepestVisibleWindowForEvents(
-    ServerWindow* root_window,
-    gfx::Point* location);
+struct DeepestWindow {
+  ServerWindow* window = nullptr;
+  bool in_non_client_area = false;
+};
+
+// Finds the deepest visible child of |root| that should receive an event at
+// |location|. |location| is in the coordinate space of |root_window|. The
+// |window| field in the returned structure is set to the child window. If no
+// valid child window is found |window| is set to null.
+DeepestWindow FindDeepestVisibleWindowForEvents(ServerWindow* root_window,
+                                                const gfx::Point& location);
 
 // Retrieve the transform to the provided |window|'s coordinate space from the
 // root.
 gfx::Transform GetTransformToWindow(ServerWindow* window);
 
 }  // namespace ws
 }  // namespace ui
 
 #endif  // SERVICES_UI_WS_WINDOW_FINDER_H_