Move automatic text track selection code to AutomaticTrackSelection helper

Source/core/html/track/AutomaticTrackSelection.h

Index: Source/core/html/track/AutomaticTrackSelection.h
diff --git a/Source/core/html/track/AutomaticTrackSelection.h b/Source/core/html/track/AutomaticTrackSelection.h
new file mode 100644
index 0000000000000000000000000000000000000000..5572d0f99988a9f08302ebce7f033a2b1a76e0fa
--- /dev/null
+++ b/Source/core/html/track/AutomaticTrackSelection.h
@@ -0,0 +1,40 @@
+// 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 AutomaticTrackSelection_h
+#define AutomaticTrackSelection_h
+
+#include "platform/heap/Handle.h"
+
+namespace blink {
+
+class TextTrackList;
+class TrackGroup;
+
+class AutomaticTrackSelection {
+    STACK_ALLOCATED();
+public:
+    struct Configuration {
+        Configuration()
+            : disableCurrentlyEnabledTracks(false)
+            , forceEnableSubtitleOrCaptionTrack(false) { }
+
+        bool disableCurrentlyEnabledTracks;
+        bool forceEnableSubtitleOrCaptionTrack;
+    };
+
+    AutomaticTrackSelection(const Configuration&);
+
+    void perform(TextTrackList&);
+
+private:
+    void performAutomaticTextTrackSelection(const TrackGroup&);
+    void enableDefaultMetadataTextTracks(const TrackGroup&);
+
+    const Configuration m_configuration;
+};
+
+} // namespace blink
+
+#endif // AutomaticTrackSelection_h