Hook up Android closed captions 'enabled' setting to Blink

Source/core/html/track/TextTrackKindUserPreference.h

Index: Source/core/html/track/TextTrackKindUserPreference.h
diff --git a/Source/core/html/track/TextTrackKindUserPreference.h b/Source/core/html/track/TextTrackKindUserPreference.h
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index 0000000000000000000000000000000000000000..871c7ec1b46f97febe32a967fb47ac95f1b6b287
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+++ b/Source/core/html/track/TextTrackKindUserPreference.h
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+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef TextTrackKindUserPreference_h
+#define TextTrackKindUserPreference_h
+
+namespace blink {
+
+// Defines user preference for text track kind.
+enum class TextTrackKindUserPreference {
+    // Display only tracks marked as default

[fs, 2015/06/24 08:59:07]

Nit: End with full stop ('.').

[srivats, 2015/07/02 01:41:21]

Done.

+    Default,
+    // Display caption tracks if available and if not display subtitles in preferred language

[fs, 2015/06/24 08:59:07]

Ditto.

[srivats, 2015/07/02 01:41:21]

Done.

+    Captions,
+    // Display subtitle tracks if available

[fs, 2015/06/24 08:59:07]

Ditto.

[philipj_slow, 2015/06/24 09:54:20]

This should also fall back to captions in the preferred language rather than the
default track, right?

[srivats, 2015/07/02 01:41:21]

Since we didn't really have a case for subtitles, I wasn't sure what the
expected behavior should be.
The reason I handled captions differently was because the closed caption setting
in platform is for the benefit of the hearing impaired. It made sense to show
them preferred language subtitles when there are no captions in preferred
language. Would it make sense to have the same behavior for Subtitles too?

[srivats, 2015/07/02 01:41:21]

Done.

[philipj_slow, 2015/07/09 15:20:49]

The documentation is the same in the most recent CL, was there some other
change? (Sorry, hard to follow big reviews.)

[srivats, 2015/07/09 21:25:37]

Sorry I missed updating this earlier.

+    Subtitles
+};
+
+} // namespace blink
+
+#endif // TextTrackKindUserPreference_h