Makes windowmanager draw non-client area

components/mus/ws/window_tree_impl.h

Index: components/mus/ws/window_tree_impl.h
diff --git a/components/mus/ws/window_tree_impl.h b/components/mus/ws/window_tree_impl.h
index c38486e6f1ad95e24c818fba16afa15460d6dc67..c8c7f8c36d5e2d9a1160e642fb6665e8b34d19e5 100644
--- a/components/mus/ws/window_tree_impl.h
+++ b/components/mus/ws/window_tree_impl.h
@@ -19,6 +19,7 @@
 #include "components/mus/ws/ids.h"
 
 namespace gfx {
+class Insets;
 class Rect;
 }
 
@@ -91,8 +92,8 @@ class WindowTreeImpl : public mojom::WindowTree, public AccessPolicyDelegate {
                                   const gfx::Rect& new_bounds,
                                   bool originated_change);
   void ProcessClientAreaChanged(const ServerWindow* window,
-                                const gfx::Rect& old_client_area,
-                                const gfx::Rect& new_client_area,
+                                const gfx::Insets& old_client_area,
+                                const gfx::Insets& new_client_area,
                                 bool originated_change);
   void ProcessViewportMetricsChanged(const mojom::ViewportMetrics& old_metrics,
                                      const mojom::ViewportMetrics& new_metrics,
@@ -220,14 +221,13 @@ class WindowTreeImpl : public mojom::WindowTree, public AccessPolicyDelegate {
   void SetImeVisibility(Id transport_window_id,
                         bool visible,
                         mojo::TextInputStatePtr state) override;
-  void SetClientArea(Id transport_window_id, mojo::RectPtr rect) override;
+  void SetClientArea(Id transport_window_id, mojo::InsetsPtr insets) override;
   void SetPreferredSize(uint32_t window_id,
                         mojo::SizePtr size,
                         const SetPreferredSizeCallback& callback) override;
   void SetShowState(uint32_t window_id,
                     mus::mojom::ShowState show_state,
                     const SetShowStateCallback& callback) override;
-  void GetDisplays(const GetDisplaysCallback& callback) override;
 
   // AccessPolicyDelegate:
   bool IsRootForAccessPolicy(const WindowId& id) const override;