mus: Implement Window Server Capture

components/mus/public/cpp/lib/window_tree_client_impl.h

Index: components/mus/public/cpp/lib/window_tree_client_impl.h
diff --git a/components/mus/public/cpp/lib/window_tree_client_impl.h b/components/mus/public/cpp/lib/window_tree_client_impl.h
index 78e37f110a6630dc293d078442a8bc4a7bd7c4f6..efd7ae903018dca5c605657153463760f9af98c1 100644
--- a/components/mus/public/cpp/lib/window_tree_client_impl.h
+++ b/components/mus/public/cpp/lib/window_tree_client_impl.h
@@ -63,6 +63,8 @@ class WindowTreeClientImpl : public WindowTreeConnection,
   void SetBounds(Window* window,
                  const gfx::Rect& old_bounds,
                  const gfx::Rect& bounds);
+  void SetCapture(Window* window);
+  void ReleaseCapture(Window* window);
   void SetClientArea(Id window_id, const gfx::Insets& client_area);
   void SetFocus(Id window_id);
   void SetVisible(Id window_id, bool visible);
@@ -145,6 +147,7 @@ class WindowTreeClientImpl : public WindowTreeConnection,
                uint32_t access_policy) override;
   void OnEmbeddedAppDisconnected(Id window_id) override;
   void OnUnembed() override;
+  void OnLostCapture(Id window_id) override;
   void OnWindowBoundsChanged(Id window_id,
                              mojo::RectPtr old_bounds,
                              mojo::RectPtr new_bounds) override;