Unit Test for WebView animating in and out of screen

android_webview/native/aw_contents.h

Index: android_webview/native/aw_contents.h
diff --git a/android_webview/native/aw_contents.h b/android_webview/native/aw_contents.h
index 26e60f23de0af8aaf5663b8b7399d1c686b2b991..7e769804923d4a7229b2435f6e2be982a38d757b 100644
--- a/android_webview/native/aw_contents.h
+++ b/android_webview/native/aw_contents.h
@@ -205,6 +205,8 @@ class AwContents : public FindHelper::Listener,
                          float min_page_scale_factor,
                          float max_page_scale_factor) override;
   void DidOverscroll(gfx::Vector2d overscroll_delta) override;
+  void ParentDrawConstraintsUpdated(
+      const ParentCompositorDrawConstraints& draw_constraints) override {}
 
   void ClearCache(JNIEnv* env, jobject obj, jboolean include_disk_files);
   void SetPendingWebContentsForPopup(scoped_ptr<content::WebContents> pending);