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 4885537b47398550b758905c4da2953ea23171b5..34abc3e308b8c485445f97dcf2c5f546bf356f9f 100644
--- a/components/mus/public/cpp/lib/window.cc
+++ b/components/mus/public/cpp/lib/window.cc
@@ -373,6 +373,18 @@ void Window::SetImeVisibility(bool visible, mojo::TextInputStatePtr state) {
     tree_client()->SetImeVisibility(id_, visible, std::move(state));
 }
 
+void Window::SetCapture() {
+  if (connection_)
+    tree_client()->SetCapture(this);
+  LocalSetCapture(true);
+}
+
+void Window::ReleaseCapture() {
+  if (connection_)
+    tree_client()->ReleaseCapture(this);
+  LocalSetCapture(false);
+}
+
 void Window::SetFocus() {
   if (connection_ && IsDrawn())
     tree_client()->SetFocus(this);
@@ -483,6 +495,7 @@ Window::Window(WindowTreeConnection* connection, Id id)
       input_event_handler_(nullptr),
       viewport_metrics_(CreateEmptyViewportMetrics()),
       visible_(false),
+      has_capture_(false),
       cursor_id_(mojom::CURSOR_NULL),
       drawn_(false) {}
 
@@ -589,6 +602,10 @@ void Window::LocalSetBounds(const gfx::Rect& old_bounds,
   bounds_ = new_bounds;
 }
 
+void Window::LocalSetCapture(bool capture) {
+  has_capture_ = capture;
+}
+
 void Window::LocalSetClientArea(
     const gfx::Insets& new_client_area,
     const std::vector<gfx::Rect>& additional_client_areas) {