Support text track selection in video controls

Source/core/html/shadow/MediaControlElementTypes.cpp

Index: Source/core/html/shadow/MediaControlElementTypes.cpp
diff --git a/Source/core/html/shadow/MediaControlElementTypes.cpp b/Source/core/html/shadow/MediaControlElementTypes.cpp
index 70d738556f731e1bee57b58bf0f4ca9d2a611bc1..8a3dbcf4a80f9466386101201f1871bc16cb242d 100644
--- a/Source/core/html/shadow/MediaControlElementTypes.cpp
+++ b/Source/core/html/shadow/MediaControlElementTypes.cpp
@@ -89,6 +89,12 @@ void MediaControlElement::show()
     m_element->removeInlineStyleProperty(CSSPropertyDisplay);
 }
 
+bool MediaControlElement::isVisible()

[philipj_slow, 2015/05/05 14:36:56]

I've been meaning to change hide() and show() to use the hidden attribute
instead, partly because of the rumor that this is a stronger signal that
display:none that it should be ignored by screen readers. Can you name this
isHidden() instead so that it would make sense if that change is made? (It also
avoids the impression that this could have to do with the visibility attribute.)

[srivats, 2016/02/23 01:39:26]

Done.

[philipj_slow, 2016/03/01 11:21:04]

Well this changed again since last, sorry about that. (See other CL.)

+{
+    const StylePropertySet* propertySet = m_element->inlineStyle();
+    return !propertySet || !propertySet->hasProperty(CSSPropertyDisplay);
+}
+
 void MediaControlElement::setDisplayType(MediaControlElementType displayType)
 {
     if (displayType == m_displayType)