Fix root ServerWindow size.

services/ui/ws/display.h

Index: services/ui/ws/display.h
diff --git a/services/ui/ws/display.h b/services/ui/ws/display.h
index 11811e5ee640635d5131b427f37a51c6ff07892a..901a5b1e962d484ef52722b7aa8bdfc3e8c62691 100644
--- a/services/ui/ws/display.h
+++ b/services/ui/ws/display.h
@@ -137,8 +137,8 @@ class Display : public PlatformDisplayDelegate,
   void SetSize(const gfx::Size& size) override;
   void SetTitle(const mojo::String& title) override;
 
-  // Updates the root window, if necessary, for viewport metric changes.
-  void OnViewportMetricsChanged(const display::ViewportMetrics& new_metrics);
+  // Updates the size of display root ServerWindow and WM root ServerWindow(s).
+  void OnViewportMetricsChanged(const display::ViewportMetrics& metrics);
 
  private:
   friend class test::DisplayTestApi;