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

services/ui/ws/access_policy.h

Index: services/ui/ws/access_policy.h
diff --git a/services/ui/ws/access_policy.h b/services/ui/ws/access_policy.h
index 638c81e9f6fa61562705628b0fa454d013dfcb40..452f17a9610925d1aa91d1f8d7ea07f9673b7b32 100644
--- a/services/ui/ws/access_policy.h
+++ b/services/ui/ws/access_policy.h
@@ -58,6 +58,7 @@ class AccessPolicy {
   virtual bool CanSetFocus(const ServerWindow* window) const = 0;
   virtual bool CanSetClientArea(const ServerWindow* window) const = 0;
   virtual bool CanSetHitTestMask(const ServerWindow* window) const = 0;
+  virtual bool CanSetAcceptEvents(const ServerWindow* window) const = 0;
   // Used for all client controllable cursor properties; which cursor should be
   // displayed, visibility, locking, etc.
   virtual bool CanSetCursorProperties(const ServerWindow* window) const = 0;