mus: Implement Window Server Capture

components/mus/ws/display_manager.cc

Index: components/mus/ws/display_manager.cc
diff --git a/components/mus/ws/display_manager.cc b/components/mus/ws/display_manager.cc
index 03eb620d2afe518f38f1823d9cb3da5cb62ed898..2384de5ee3c565e9a77f0d3b5bb97a716bd47fb7 100644
--- a/components/mus/ws/display_manager.cc
+++ b/components/mus/ws/display_manager.cc
@@ -212,6 +212,14 @@ void DefaultDisplayManager::SetTitle(const base::string16& title) {
   platform_window_->SetTitle(title);
 }
 
+void DefaultDisplayManager::SetCapture() {
+  platform_window_->SetCapture();
+}
+
+void DefaultDisplayManager::ReleaseCapture() {
+  platform_window_->ReleaseCapture();
+}
+
 const mojom::ViewportMetrics& DefaultDisplayManager::GetViewportMetrics() {
   return metrics_;
 }
@@ -369,7 +377,9 @@ void DefaultDisplayManager::OnClosed() {
 void DefaultDisplayManager::OnWindowStateChanged(
     ui::PlatformWindowState new_state) {}
 
-void DefaultDisplayManager::OnLostCapture() {}
+void DefaultDisplayManager::OnLostCapture() {
+  delegate_->OnLostCapture();
+}
 
 void DefaultDisplayManager::OnAcceleratedWidgetAvailable(
     gfx::AcceleratedWidget widget,