Unit Test for WebView animating in and out of screen

android_webview/browser/browser_view_renderer.h

Index: android_webview/browser/browser_view_renderer.h
diff --git a/android_webview/browser/browser_view_renderer.h b/android_webview/browser/browser_view_renderer.h
index 843529b282b8b3568d18aa143f407fd5200d4e06..b8ce078798a141ddb37a3a189d1a6adc7bfd36d7 100644
--- a/android_webview/browser/browser_view_renderer.h
+++ b/android_webview/browser/browser_view_renderer.h
@@ -113,6 +113,11 @@ class BrowserViewRenderer : public content::SynchronousCompositorClient {
   void UpdateParentDrawConstraints();
   void DetachFunctorFromView();
 
+  // Visible for testing.
+  const gfx::Rect& global_visible_rect_for_testing() {
+    return last_on_draw_global_visible_rect_;
+  }
+
  private:
   void SetTotalRootLayerScrollOffset(gfx::Vector2dF new_value_dip);
   bool CanOnDraw();