FrameGenerator should receive SurfaceInfo and use it in frame generation

services/ui/ws/test_utils.h

Index: services/ui/ws/test_utils.h
diff --git a/services/ui/ws/test_utils.h b/services/ui/ws/test_utils.h
index 6701e948fc220a6e1a251b94b22ebac38522d5c4..92daf8104b38aa73f8472da1fd774baa8eebffcc 100644
--- a/services/ui/ws/test_utils.h
+++ b/services/ui/ws/test_utils.h
@@ -285,16 +285,12 @@ class TestPlatformDisplayFactory : public PlatformDisplayFactory {
 // A stub implementation of FrameGeneratorDelegate.
 class TestFrameGeneratorDelegate : public FrameGeneratorDelegate {
  public:
-  TestFrameGeneratorDelegate(ServerWindow* root_window);
+  TestFrameGeneratorDelegate();
   ~TestFrameGeneratorDelegate() override;
 
   // FrameGeneratorDelegate:
-  ServerWindow* GetActiveRootWindow() override;
   bool IsInHighContrastMode() override;
 
- private:
-  ServerWindow* root_window_;
-
   DISALLOW_COPY_AND_ASSIGN(TestFrameGeneratorDelegate);
 };