Media Controls: Use events to update controls for closed captions.

third_party/WebKit/Source/core/html/shadow/MediaControls.cpp

Index: third_party/WebKit/Source/core/html/shadow/MediaControls.cpp
diff --git a/third_party/WebKit/Source/core/html/shadow/MediaControls.cpp b/third_party/WebKit/Source/core/html/shadow/MediaControls.cpp
index 5b4b0b7b707d21ec773acb1c80f361aa5d401624..b46bd4bbd0ed33023260755a9a82acbe5107aec7 100644
--- a/third_party/WebKit/Source/core/html/shadow/MediaControls.cpp
+++ b/third_party/WebKit/Source/core/html/shadow/MediaControls.cpp
@@ -339,8 +339,7 @@ void MediaControls::reset() {
   m_timeline->setPosition(mediaElement().currentTime());
 
   onVolumeChange();
-
-  refreshClosedCaptionsButtonVisibility();
+  onTextTracksAddedOrRemoved();
 
   m_fullscreenButton->setIsWanted(shouldShowFullscreenButton(mediaElement()));
 
@@ -454,15 +453,6 @@ void MediaControls::updateCurrentTimeDisplay() {
   m_currentTimeDisplay->setCurrentValue(now);
 }
 
-void MediaControls::changedClosedCaptionsVisibility() {
-  m_toggleClosedCaptionsButton->updateDisplayType();
-}
-
-void MediaControls::refreshClosedCaptionsButtonVisibility() {
-  m_toggleClosedCaptionsButton->setIsWanted(mediaElement().hasClosedCaptions());
-  BatchedControlUpdate batch(this);
-}
-
 void MediaControls::toggleTextTrackList() {
   if (!mediaElement().hasClosedCaptions()) {
     m_textTrackList->setVisible(false);
@@ -724,6 +714,15 @@ void MediaControls::onPause() {
   stopHideMediaControlsTimer();
 }
 
+void MediaControls::onTextTracksAddedOrRemoved() {
+  m_toggleClosedCaptionsButton->setIsWanted(mediaElement().hasClosedCaptions());
+  BatchedControlUpdate batch(this);
+}
+
+void MediaControls::onTextTracksChanged() {
+  m_toggleClosedCaptionsButton->updateDisplayType();
+}
+
 void MediaControls::notifyPanelWidthChanged(const LayoutUnit& newWidth) {
   // Don't bother to do any work if this matches the most recent panel
   // width, since we're called after layout.