Start separating the text track container from the media controls

Source/core/core.gypi

 {
     'includes': [
         'core_generated.gypi',
     ],
     'variables': {
         # Files for which bindings (.cpp and .h files) will be generated
         'core_idl_files': [
             'animation/Animation.idl',
             'animation/AnimationEffect.idl',
             'animation/AnimationNode.idl',
@@ skipping 693 matching lines @@
             'layout/LayoutTableRow.cpp',
             'layout/LayoutTableRow.h',
             'layout/LayoutTableSection.cpp',
             'layout/LayoutTableSection.h',
             'layout/LayoutTextControl.cpp',
             'layout/LayoutTextControl.h',
             'layout/LayoutTextControlMultiLine.cpp',
             'layout/LayoutTextControlMultiLine.h',
             'layout/LayoutTextControlSingleLine.cpp',
             'layout/LayoutTextControlSingleLine.h',
-            'layout/LayoutTextTrackContainerElement.cpp',
-            'layout/LayoutTextTrackContainerElement.h',
+            'layout/LayoutTextTrackContainer.cpp',
+            'layout/LayoutTextTrackContainer.h',
             'layout/LayoutTheme.cpp',
             'layout/LayoutTheme.h',
             'layout/LayoutThemeAndroid.cpp',
             'layout/LayoutThemeAndroid.h',
             'layout/LayoutThemeDefault.cpp',
             'layout/LayoutThemeDefault.h',
             'layout/LayoutThemeFontProvider.cpp',
             'layout/LayoutThemeFontProvider.h',
             'layout/LayoutThemeFontProviderLinux.cpp',
             'layout/LayoutThemeFontProviderWin.cpp',
@@ skipping 2338 matching lines @@
             'html/track/AutomaticTrackSelection.cpp',
             'html/track/AutomaticTrackSelection.h',
             'html/track/CueTimeline.cpp',
             'html/track/CueTimeline.h',
             'html/track/InbandTextTrack.cpp',
             'html/track/InbandTextTrack.h',
             'html/track/LoadableTextTrack.cpp',
             'html/track/LoadableTextTrack.h',
             'html/track/TextTrack.cpp',
             'html/track/TextTrack.h',
+            'html/track/TextTrackContainer.cpp',
+            'html/track/TextTrackContainer.h',
             'html/track/TextTrackCue.cpp',
             'html/track/TextTrackCue.h',
             'html/track/TextTrackCueList.cpp',
             'html/track/TextTrackCueList.h',
             'html/track/TextTrackList.cpp',
             'html/track/TrackBase.cpp',
             'html/track/TrackBase.h',
             'html/track/TrackEvent.cpp',
             'html/track/TrackListBase.h',
             'html/track/VideoTrack.cpp',
@@ skipping 749 matching lines @@
             'paint/ViewDisplayListTest.cpp',
             'streams/ExclusiveStreamReaderTest.cpp',
             'streams/ReadableStreamTest.cpp',
             'testing/PrivateScriptTestTest.cpp',
             'testing/UnitTestHelpers.cpp',
             'testing/UnitTestHelpers.h',
             'xml/parser/SharedBufferReaderTest.cpp',
         ],
     }
 }