Add MediaControlTimelineElement FIXME for "timeline offset"

Source/core/html/shadow/MediaControlElements.cpp

 /*
  * Copyright (C) 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 356 matching lines @@
     if (event->type() == EventTypeNames::mouseup)
         mediaControls().endScrubbing();
 
     MediaControlInputElement::defaultEventHandler(event);
 
     if (event->type() == EventTypeNames::mouseover || event->type() == EventTypeNames::mouseout || event->type() == EventTypeNames::mousemove)
         return;
 
     double time = value().toDouble();
     if (event->type() == EventTypeNames::input) {
+        // FIXME: This will need to take the timeline offset into consideration
+        // once that concept is supported, see https://crbug.com/312699
         if (mediaElement().controller())
             mediaElement().controller()->setCurrentTime(time, IGNORE_EXCEPTION);
         else
             mediaElement().setCurrentTime(time, IGNORE_EXCEPTION);
     }
 
     RenderSlider* slider = toRenderSlider(renderer());
     if (slider && slider->inDragMode())
         mediaControls().updateCurrentTimeDisplay();
 }
@@ skipping 287 matching lines @@
     float fontSize = smallestDimension * 0.05f;
     if (fontSize != m_fontSize) {
         m_fontSize = fontSize;
         setInlineStyleProperty(CSSPropertyFontSize, fontSize, CSSPrimitiveValue::CSS_PX);
     }
 }
 
 // ----------------------------
 
 } // namespace WebCore