mus: Implement Window Server Capture

components/mus/public/cpp/lib/window.cc

Index: components/mus/public/cpp/lib/window.cc
diff --git a/components/mus/public/cpp/lib/window.cc b/components/mus/public/cpp/lib/window.cc
index 5258d7cbb560319a4c61f64d8c9d53ef79f2233b..e6c86d33a378098947389550bd0bf95851bc8436 100644
--- a/components/mus/public/cpp/lib/window.cc
+++ b/components/mus/public/cpp/lib/window.cc
@@ -377,6 +377,16 @@ void Window::SetResizeBehavior(mojom::ResizeBehavior resize_behavior) {
         ->SetResizeBehavior(id_, resize_behavior);
 }
 
+void Window::SetCapture() {
+  if (connection_)

[sky, 2015/11/17 01:06:41]

We should track capture locally too.

+    static_cast<WindowTreeClientImpl*>(connection_)->SetCapture(this);
+}
+
+void Window::ReleaseCapture() {
+  if (connection_)
+    static_cast<WindowTreeClientImpl*>(connection_)->ReleaseCapture(this);
+}
+
 void Window::SetFocus() {
   if (connection_)
     static_cast<WindowTreeClientImpl*>(connection_)->SetFocus(id_);