FrameGenerator should receive SurfaceInfo and use it in frame generation

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 28bf83b5a6a58ca2d24e5e9e06e9fba000523fa8..b471605d047dfca2ce909cf7e5f7a90254f59078 100644
--- a/services/ui/ws/display.h
+++ b/services/ui/ws/display.h
@@ -143,6 +143,8 @@ class Display : public PlatformDisplayDelegate,
   // Updates the size of display root ServerWindow and WM root ServerWindow(s).
   void OnViewportMetricsChanged(const display::ViewportMetrics& metrics);
 
+  ServerWindow* GetActiveRootWindow() override;
+
  private:
   friend class test::DisplayTestApi;
 
@@ -166,7 +168,6 @@ class Display : public PlatformDisplayDelegate,
   // PlatformDisplayDelegate:
   display::Display GetDisplay() override;
   ServerWindow* GetRootWindow() override;
-  ServerWindow* GetActiveRootWindow() override;
   void OnAcceleratedWidgetAvailable() override;
   bool IsInHighContrastMode() override;
   void OnEvent(const ui::Event& event) override;