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

services/ui/ws/window_tree.cc

 // 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.
 
 #include "services/ui/ws/window_tree.h"
 
 #include <stddef.h>
 
 #include <utility>
 
@@ skipping 329 matching lines @@
   }
 
   Operation op(this, window_server_, OperationType::SET_FOCUS);
   bool success = window_server_->SetFocusedWindow(window);
   if (!success) {
     DVLOG(1) << "SetFocus failure, could not SetFocusedWindow.";
   }
   return success;
 }
 
+void WindowTree::SetCanAcceptEvents(Id transport_window_id,
+                                    bool can_accept_events) {
+  ServerWindow* window =
+      GetWindowByClientId(ClientWindowId(transport_window_id));
+  if (window && access_policy_->CanSetAcceptEvents(window))
+    window->set_can_accept_events(can_accept_events);

[sadrul, 2016/07/12 17:32:33]

Add a TODO here to check that there aren't any entries in |event_queue_| for
|window|

[riajiang, 2016/07/12 18:46:40]

Done.

+}
+
 bool WindowTree::Embed(const ClientWindowId& window_id,
                        mojom::WindowTreeClientPtr client,
                        uint32_t flags) {
   if (!client || !CanEmbed(window_id))
     return false;
   ServerWindow* window = GetWindowByClientId(window_id);
   PrepareForEmbed(window);
   // When embedding we don't know the user id of where the TreeClient came
   // from. Use an invalid id, which limits what the client is able to do.
   window_server_->EmbedAtWindow(window, InvalidUserId(), std::move(client),
@@ skipping 1260 matching lines @@
 }
 
 bool WindowTree::IsWindowRootOfAnotherTreeForAccessPolicy(
     const ServerWindow* window) const {
   WindowTree* tree = window_server_->GetTreeWithRoot(window);
   return tree && tree != this;
 }
 
 }  // namespace ws
 }  // namespace ui