mus: Implement Window Server Capture

components/mus/ws/window_tree_unittest.cc

Index: components/mus/ws/window_tree_unittest.cc
diff --git a/components/mus/ws/window_tree_unittest.cc b/components/mus/ws/window_tree_unittest.cc
index 3c13428bd0c04875dd082064dbe1ab7da4505cc1..2ef62a982133d7f8e0d98fc417781b19293ad82a 100644
--- a/components/mus/ws/window_tree_unittest.cc
+++ b/components/mus/ws/window_tree_unittest.cc
@@ -70,6 +70,7 @@ class TestWindowTreeClient : public mus::mojom::WindowTreeClient {
     tracker_.OnEmbeddedAppDisconnected(window);
   }
   void OnUnembed() override { tracker_.OnUnembed(); }
+  void OnLostCapture(Id window_id) override {}
   void OnWindowBoundsChanged(uint32_t window,
                              mojo::RectPtr old_bounds,
                              mojo::RectPtr new_bounds) override {
@@ -236,6 +237,8 @@ class TestDisplayManager : public DisplayManager {
                      const gfx::Rect& bounds) override {}
   void SetViewportSize(const gfx::Size& size) override {}
   void SetTitle(const base::string16& title) override {}
+  void SetCapture() override {}
+  void ReleaseCapture() override {}
   const mojom::ViewportMetrics& GetViewportMetrics() override {
     return display_metrices_;
   }