mus: Let clients set the cursor of their window.

components/mus/ws/server_window.h

Index: components/mus/ws/server_window.h
diff --git a/components/mus/ws/server_window.h b/components/mus/ws/server_window.h
index 89d291b393581b6e8049916c40b74d198654eafc..b97f2f8a50a5077bc1e7c0fb8e135a0a1fe9d62c 100644
--- a/components/mus/ws/server_window.h
+++ b/components/mus/ws/server_window.h
@@ -74,6 +74,8 @@ class ServerWindow {
   const gfx::Insets& client_area() const { return client_area_; }
   void SetClientArea(const gfx::Insets& insets);
 
+  int32_t cursor() const { return cursor_id_; }
+
   const ServerWindow* parent() const { return parent_; }
   ServerWindow* parent() { return parent_; }
 
@@ -111,6 +113,8 @@ class ServerWindow {
   float opacity() const { return opacity_; }
   void SetOpacity(float value);
 
+  void SetCursor(mus::mojom::Cursor cursor_id);

[sky, 2015/12/01 21:48:00]

Name this consistently with the mojom, so either PredefinedCursor (if you go
with that) or StandardCursor.

+
   const gfx::Transform& transform() const { return transform_; }
   void SetTransform(const gfx::Transform& transform);
 
@@ -181,6 +185,7 @@ class ServerWindow {
   gfx::Rect bounds_;
   gfx::Insets client_area_;
   scoped_ptr<ServerWindowSurfaceManager> surface_manager_;
+  mojom::Cursor cursor_id_;
   float opacity_;
   bool can_focus_;
   gfx::Transform transform_;