Merge 133610

Source/WebCore/html/track/TextTrackCueList.cpp

Index: Source/WebCore/html/track/TextTrackCueList.cpp
===================================================================
--- Source/WebCore/html/track/TextTrackCueList.cpp	(revision 134273)
+++ Source/WebCore/html/track/TextTrackCueList.cpp	(working copy)
@@ -92,12 +92,12 @@
     // http://www.whatwg.org/specs/web-apps/current-work/#text-track-cue-order
     RefPtr<TextTrackCue> cue = prpCue;
     if (start == end) {
-        if (!m_list.isEmpty() && (m_list[start - 1].get() == cue.get()))
+        if (!m_list.isEmpty() && (start > 0) && (m_list[start - 1].get() == cue.get()))
             return false;
 
-       m_list.insert(start, cue);
-       invalidateCueIndexes(start);
-       return true;
+        m_list.insert(start, cue);
+        invalidateCueIndexes(start);
+        return true;
     }
 
     size_t index = (start + end) / 2;