Support text track selection in video controls

third_party/WebKit/Source/core/html/track/TextTrack.cpp

Index: third_party/WebKit/Source/core/html/track/TextTrack.cpp
diff --git a/third_party/WebKit/Source/core/html/track/TextTrack.cpp b/third_party/WebKit/Source/core/html/track/TextTrack.cpp
index 1cd60174bdb63963e3b387e178c1848c9b1bfd7f..70871fd393ab546b63a40ba6bd3fee269ce8dc2b 100644
--- a/third_party/WebKit/Source/core/html/track/TextTrack.cpp
+++ b/third_party/WebKit/Source/core/html/track/TextTrack.cpp
@@ -425,6 +425,18 @@ bool TextTrack::isRendered()
     return true;
 }
 
+bool TextTrack::canBeRendered()
+{
+    // A track can be displayed when it's of kind captions or subtitles and hasn't failed to load.
+    if (kind() != captionsKeyword() && kind() != subtitlesKeyword())
+        return false;
+
+    if (readinessState() == FailedToLoad)

[philipj_slow, 2016/03/01 08:51:40]

This has been renamed to getReadinessState() in
https://codereview.chromium.org/1740483004

[srivats, 2016/03/30 00:46:43]

Done.

+        return false;
+
+    return true;
+}
+
 TextTrackCueList* TextTrack::ensureTextTrackCueList()
 {
     if (!m_cues)