Media Controls: Remove download button for infinite streams

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 661 matching lines @@
   const KURL& url = mediaElement().currentSrc();
 
   // Check page settings to see if download is disabled.
   if (document().page() && document().page()->settings().getHideDownloadUI())
     return false;
 
   // URLs that lead to nowhere are ignored.
   if (url.isNull() || url.isEmpty())
     return false;
 
-  // Local files and blobs should not have a download button.
+  // Local files and blobs (including MSE) should not have a download button.
   if (url.isLocalFile() || url.protocolIs("blob"))
     return false;
 
   // MediaStream can't be downloaded.
   if (HTMLMediaElement::isMediaStreamURL(url.getString()))
     return false;
 
   // MediaSource can't be downloaded.
   if (HTMLMediaSource::lookup(url))
     return false;
 
   // 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;
+
   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 333 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