Support subtitles for native fullscreen video

LayoutTests/TestExpectations

Index: LayoutTests/TestExpectations
diff --git a/LayoutTests/TestExpectations b/LayoutTests/TestExpectations
index 5e94dab1d2246036ba0f41b317f1f9920d6105c7..6a21e4e700ed285b7a2e8acc9cb164db8f741a74 100644
--- a/LayoutTests/TestExpectations
+++ b/LayoutTests/TestExpectations
@@ -1324,3 +1324,10 @@ crbug.com/51854 [ Win ] http/tests/storage/callbacks-are-called-in-correct-conte
 
 crbug.com/295011 [ Win ] http/tests/cache/subresource-expiration-1.html [ Timeout Pass ]
 crbug.com/295011 [ Win ] http/tests/cache/subresource-expiration-2.html [ Timeout Pass ]
+
+# Android virtual suite shares the same expectation.
+crbug.com/100798 [ Debug ] virtual/android/fullscreen/full-screen-iframe-allowed.html [ Failure Pass ]
+crbug.com/100798 [ Debug ] virtual/android/fullscreen/full-screen-iframe-allowed-prefixed.html [ Failure Pass ]
+webkit.org/b/90704 virtual/android/fullscreen/exit-full-screen-iframe.html [ Failure Pass ]
+crbug.com/243782 virtual/android/fullscreen/full-screen-remove-ancestor.html [ Pass Timeout ]
+crbug.com/246077 virtual/android/fullscreen/full-screen-render-inline.html [ ImageOnlyFailure ]