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

services/ui/ws/window_finder.h

Index: services/ui/ws/window_finder.h
diff --git a/services/ui/ws/window_finder.h b/services/ui/ws/window_finder.h
index a1dbe005ab42b42b06ad7948b457ab0ce6ccaa25..8f203c45f103d7672e5e689c0674f1e74b074770 100644
--- a/services/ui/ws/window_finder.h
+++ b/services/ui/ws/window_finder.h
@@ -15,13 +15,17 @@ 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.