mus: Disregard windows that explicitly set can_accept_events to be false when sending events.

services/ui/ws/window_finder.cc

Index: services/ui/ws/window_finder.cc
diff --git a/services/ui/ws/window_finder.cc b/services/ui/ws/window_finder.cc
index 09be99308ce1fe50dcfc4282af6331da7f931549..0b46df6a0acbc3763aa4e0ba04e091e96f62993a 100644
--- a/services/ui/ws/window_finder.cc
+++ b/services/ui/ws/window_finder.cc
@@ -26,9 +26,12 @@ bool IsValidWindowForEvents(ServerWindow* window) {
 
 ServerWindow* FindDeepestVisibleWindowForEvents(ServerWindow* window,
                                                 gfx::Point* location) {
+  if (!window->can_accept_events())
+    return nullptr;
+
   const ServerWindow::Windows& children = window->children();
   for (ServerWindow* child : base::Reversed(children)) {
-    if (!child->visible())
+    if (!child->visible() || !child->can_accept_events())
       continue;
 
     // TODO(sky): support transform.