aura-mus: Implement Deactivate().

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 1567 matching lines @@
   // Only the owner of the window can change the bounds.
   bool success = window && access_policy_->CanSetCursorProperties(window);
   if (success) {
     Operation op(this, window_server_,
                  OperationType::SET_WINDOW_PREDEFINED_CURSOR);
     window->SetPredefinedCursor(cursor_id);
   }
   client()->OnChangeCompleted(change_id, success);
 }
 
+void WindowTree::DeactivateWindow(Id requester_window_id) {

[sky, 2017/01/12 00:55:39]

window_id

[Elliot Glaysher, 2017/01/12 23:20:37]

Done.

+  ServerWindow* window =
+      GetWindowByClientId(ClientWindowId(requester_window_id));
+  if (!window) {
+    DVLOG(1) << "ActivateNextWindow received invalid id.";
+    return;
+  }
+
+  WindowManagerDisplayRoot* display_root =

[sky, 2017/01/12 00:55:39]

Make sure you null check display_root. null happens if the window isn't parented
to a display. See other functions that use WindowManagerDisplayRoot for the set
of null checks.

[Elliot Glaysher, 2017/01/12 23:20:37]

Done.

+      GetWindowManagerDisplayRoot(window);
+  WindowTree* wm_tree = display_root->window_manager_state()->window_tree();
+  wm_tree->window_manager_internal_->WmDeactivateWindow(
+      wm_tree->ClientWindowIdForWindow(window).id);
+}
+
 void WindowTree::GetWindowManagerClient(
     mojo::AssociatedInterfaceRequest<mojom::WindowManagerClient> internal) {
   if (!access_policy_->CanSetWindowManager() || !window_manager_internal_ ||
       window_manager_internal_client_binding_) {
     return;
   }
   window_manager_internal_client_binding_.reset(
       new mojo::AssociatedBinding<mojom::WindowManagerClient>(
           this, std::move(internal)));
 }
@@ skipping 412 matching lines @@
   client()->OnCompleteDrop(client_window_id.id, event_flags, cursor_offset,
                            effect_bitmask, callback);
 }
 
 void WindowTree::PerformOnDragDropDone() {
   client()->OnDragDropDone();
 }
 
 }  // namespace ws
 }  // namespace ui