Support text track selection in video controls

third_party/WebKit/Source/core/html/HTMLMediaElement.cpp

Index: third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
diff --git a/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp b/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
index a10491cfbac6f7463e57e54240a6abec84fb8f2e..5a548842dd65eed14c3647a6b1ccc2b816670e15 100644
--- a/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
@@ -328,6 +328,7 @@ HTMLMediaElement::HTMLMediaElement(const QualifiedName& tagName, Document& docum
     , m_sentEndEvent(false)
     , m_closedCaptionsVisible(false)
     , m_havePreparedToPlay(false)
+    , m_didPerformAutomaticTrackSelection(false)
     , m_tracksAreReady(true)
     , m_processingPreferenceChange(false)
     , m_remoteRoutesAvailable(false)
@@ -1173,6 +1174,11 @@ void HTMLMediaElement::textTrackModeChanged(TextTrack* track)
     textTracks()->scheduleChangeEvent();
 }
 
+void HTMLMediaElement::disableAutomaticTextTrackSelection()
+{
+    m_didPerformAutomaticTrackSelection = true;

[philipj_slow, 2016/03/01 13:01:16]

This is a bit of a lie, automatic track selection actually didn't happen. Change
it to m_shouldPerform... and set it to false here instead? There are already a
bunch of things initialized to true, so any hope of initializing
HTMLMediaElement with all zeroes is lost.

[srivats, 2016/03/30 00:46:42]

Done.

+}
+
 bool HTMLMediaElement::isSafeToLoadURL(const KURL& url, InvalidURLAction actionIfInvalid)
 {
     if (!url.isValid()) {
@@ -2497,6 +2503,9 @@ void HTMLMediaElement::honorUserPreferencesForAutomaticTextTrackSelection()
     if (!m_textTracks || !m_textTracks->length())
         return;
 
+    if (m_didPerformAutomaticTrackSelection)
+        return;
+
     AutomaticTrackSelection::Configuration configuration;
     if (m_processingPreferenceChange)
         configuration.disableCurrentlyEnabledTracks = true;