mash: Preliminary support for widget hit test masks

components/mus/ws/access_policy.h

Index: components/mus/ws/access_policy.h
diff --git a/components/mus/ws/access_policy.h b/components/mus/ws/access_policy.h
index 123611bad26013470b6140214cd68432156d96b8..dfdcc7441857dcb7161f2c3413f31bd00726d4d1 100644
--- a/components/mus/ws/access_policy.h
+++ b/components/mus/ws/access_policy.h
@@ -57,6 +57,7 @@ class AccessPolicy {
   virtual bool CanSetCapture(const ServerWindow* window) const = 0;
   virtual bool CanSetFocus(const ServerWindow* window) const = 0;
   virtual bool CanSetClientArea(const ServerWindow* window) const = 0;
+  virtual bool CanSetHitTestMask(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;