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

services/ui/ws/window_tree.h

 // Copyright 2014 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_TREE_H_
 #define SERVICES_UI_WS_WINDOW_TREE_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 376 matching lines @@
   void AttachSurface(Id transport_window_id,
                      mojom::SurfaceType type,
                      mojo::InterfaceRequest<mojom::Surface> surface,
                      mojom::SurfaceClientPtr client) override;
   void Embed(Id transport_window_id,
              mojom::WindowTreeClientPtr client,
              uint32_t flags,
              const EmbedCallback& callback) override;
   void SetFocus(uint32_t change_id, Id transport_window_id) override;
   void SetCanFocus(Id transport_window_id, bool can_focus) override;
+  void SetCanAcceptEvents(Id transport_window_id,
+                          bool can_accept_events) override;
   void SetPredefinedCursor(uint32_t change_id,
                            Id transport_window_id,
                            ui::mojom::Cursor cursor_id) override;
   void SetWindowTextInputState(Id transport_window_id,
                                mojo::TextInputStatePtr state) override;
   void SetImeVisibility(Id transport_window_id,
                         bool visible,
                         mojo::TextInputStatePtr state) override;
   void OnWindowInputEventAck(uint32_t event_id,
                              mojom::EventResult result) override;
@@ skipping 96 matching lines @@
       waiting_for_top_level_window_info_;
   bool embedder_intercepts_events_ = false;
 
   DISALLOW_COPY_AND_ASSIGN(WindowTree);
 };
 
 }  // namespace ws
 }  // namespace ui
 
 #endif  // SERVICES_UI_WS_WINDOW_TREE_H_