aura-mus: Implement Deactivate().

ui/aura/mus/window_tree_client.cc

Index: ui/aura/mus/window_tree_client.cc
diff --git a/ui/aura/mus/window_tree_client.cc b/ui/aura/mus/window_tree_client.cc
index 9a4c1065d49ec4a0d9b071a135317d39d20ddd43..13660c96943379fbde45e8063fb00f656942a44e 100644
--- a/ui/aura/mus/window_tree_client.cc
+++ b/ui/aura/mus/window_tree_client.cc
@@ -1466,6 +1466,24 @@ void WindowTreeClient::WmCancelMoveLoop(uint32_t change_id) {
     window_manager_delegate_->OnWmCancelMoveLoop(window->GetWindow());
 }
 
+void WindowTreeClient::WmDeactivateWindow(Id window_id) {
+  if (!window_manager_delegate_)
+    return;
+
+  WindowMus* window = GetWindowByServerId(window_id);
+  if (!window) {
+    DVLOG(1) << "Attempt to deactivate invalid window " << window_id;
+    return;
+  }
+
+  if (!window_manager_delegate_->IsWindowActive(window->GetWindow())) {
+    DVLOG(1) << "Non-active window requested deactivation.";
+    return;
+  }
+
+  window_manager_delegate_->OnWmDeactivateWindow(window->GetWindow());
+}
+
 void WindowTreeClient::OnAccelerator(uint32_t ack_id,
                                      uint32_t accelerator_id,
                                      std::unique_ptr<ui::Event> event) {
@@ -1586,6 +1604,12 @@ void WindowTreeClient::OnWindowTreeHostHitTestMaskWillChange(
                         out_rect);
 }
 
+void WindowTreeClient::OnWindowTreeHostDeactivateWindow(
+    WindowTreeHostMus* window_tree_host) {
+  tree_->DeactivateWindow(
+      WindowMus::Get(window_tree_host->window())->server_id());
+}
+
 std::unique_ptr<WindowPortMus> WindowTreeClient::CreateWindowPortForTopLevel(
     const std::map<std::string, std::vector<uint8_t>>* properties) {
   std::unique_ptr<WindowPortMus> window_port =