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

services/ui/public/cpp/lib/window_tree_client.cc

Index: services/ui/public/cpp/lib/window_tree_client.cc
diff --git a/services/ui/public/cpp/lib/window_tree_client.cc b/services/ui/public/cpp/lib/window_tree_client.cc
index 570d3e10d63b5c0b8b3995c1b1dfd3e4a4e80204..cbec771c7409e2f1a56fa693cb88341ede70c70e 100644
--- a/services/ui/public/cpp/lib/window_tree_client.cc
+++ b/services/ui/public/cpp/lib/window_tree_client.cc
@@ -705,6 +705,15 @@ void WindowTreeClient::RemoveObserver(WindowTreeClientObserver* observer) {
   observers_.RemoveObserver(observer);
 }
 
+void WindowTreeClient::SetCanAcceptEvents(Id window_id,
+                                          bool can_accept_events) {
+  DCHECK(tree_);
+  if (can_accept_events_ != can_accept_events) {
+    tree_->SetCanAcceptEvents(window_id, can_accept_events);
+    can_accept_events_ = can_accept_events;

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

This is wrong. Some window in a WindowTreeClient may want to accept events,
while some other windows in the same WTC may not. |can_accept_events_| should be
something tracked in mus::Window, not in WindowTreeClient.

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

Done. Moved to ui::Window.

+  }
+}
+
 void WindowTreeClient::OnEmbed(ClientSpecificId client_id,
                                    mojom::WindowDataPtr root_data,
                                    mojom::WindowTreePtr tree,