Include viewport visibility checks for autoplay experiment.

third_party/WebKit/Source/core/testing/Internals.cpp

Index: third_party/WebKit/Source/core/testing/Internals.cpp
diff --git a/third_party/WebKit/Source/core/testing/Internals.cpp b/third_party/WebKit/Source/core/testing/Internals.cpp
index a7c18c2036d87cdca8c8e8720a8d28609da1d9c7..1b704fef525a4712436a5dc8450d2a1f5907ff91 100644
--- a/third_party/WebKit/Source/core/testing/Internals.cpp
+++ b/third_party/WebKit/Source/core/testing/Internals.cpp
@@ -2569,4 +2569,10 @@ void Internals::setMediaElementNetworkState(HTMLMediaElement* mediaElement, int
     mediaElement->setNetworkState(static_cast<WebMediaPlayer::NetworkState>(state));
 }
 
+// TODO(liberato): remove once autoplay gesture override experiment concludes.
+void Internals::triggerAutoplayViewportCheck(HTMLMediaElement* element)
+{
+    element->triggerAutoplayViewportCheckForTesting();
+}
+
 } // namespace blink