[Blink, Media] Added controlsList to HTMLMediaElement

third_party/WebKit/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 682 matching lines @@
 
   // HLS stream shouldn't have a download button.
   if (HTMLMediaElement::isHLSURL(url))
     return false;
 
   // Infinite streams don't have a clear end at which to finish the download
   // (would require adding UI to prompt for the duration to download).
   if (mediaElement().duration() == std::numeric_limits<double>::infinity())
     return false;
 
+  // The attribute disables the download button.
+  if (mediaElement().controlsList()->tokens().contains("nodownload"))
+    return false;

[mlamouri (slow - plz ping), 2017/03/01 16:20:21]

Can you add a histogram for this and the ones below? Alternatively, a UseCounter
could be added to check which tokens are set instead of which ones are used.

+
   return true;
 }
 
 void MediaControlDownloadButtonElement::defaultEventHandler(Event* event) {
   const KURL& url = mediaElement().currentSrc();
   if (event->type() == EventTypeNames::click &&
       !(url.isNull() || url.isEmpty())) {
     Platform::current()->recordAction(
         UserMetricsAction("Media.Controls.Download"));
     if (!m_anchor) {
@@ skipping 340 matching lines @@
 MediaControlCurrentTimeDisplayElement*
 MediaControlCurrentTimeDisplayElement::create(MediaControls& mediaControls) {
   MediaControlCurrentTimeDisplayElement* element =
       new MediaControlCurrentTimeDisplayElement(mediaControls);
   element->setShadowPseudoId(
       AtomicString("-webkit-media-controls-current-time-display"));
   return element;
 }
 
 }  // namespace blink