ViewRoot class for event forwarding on Android

ui/display/test/test_screen.h

Index: ui/display/test/test_screen.h
diff --git a/ui/display/test/test_screen.h b/ui/display/test/test_screen.h
index 5672e7d0ae1dd76003d7a328bbefbd1bc83c1dde..3528acc30103b4b335a08d71f037d9d9bee2e547 100644
--- a/ui/display/test/test_screen.h
+++ b/ui/display/test/test_screen.h
@@ -30,6 +30,10 @@ class TestScreen : public ScreenBase {
   bool IsWindowUnderCursor(gfx::NativeWindow window) override;
   gfx::NativeWindow GetWindowAtScreenPoint(const gfx::Point& point) override;
   Display GetDisplayNearestWindow(gfx::NativeView view) const override;
+#if defined(OS_ANDROID)
+  Display GetDisplayNearestWindowAndroid(gfx::NativeWindow window)
+      const override;
+#endif
 
  private:
   DISALLOW_COPY_AND_ASSIGN(TestScreen);