MSE, MS, and any blob URL: Ignore preload 'none' on resource fetching

third_party/WebKit/Source/core/html/HTMLMediaElement.cpp

 /*
  * Copyright (C) 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple 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.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 978 matching lines @@
     setPlayerPreload();
 
     if (fastHasAttribute(mutedAttr))
         m_muted = true;
     updateVolume();
 
     ASSERT(!m_mediaSource);
 
     bool attemptLoad = true;
 
-    if (source.isMediaStream() || url.protocolIs(mediaSourceBlobProtocol)) {
+    bool isStreamOrBlobUrl = source.isMediaStream() || url.protocolIs(mediaSourceBlobProtocol);
+    if (isStreamOrBlobUrl) {
         bool isMediaStream = source.isMediaStream() || (source.isURL() && isMediaStreamURL(url.getString()));
         if (isMediaStream) {
             m_autoplayHelper->removeUserGestureRequirement(GesturelessPlaybackEnabledByStream);
         } else {
             m_mediaSource = HTMLMediaSource::lookup(url.getString());
 
             if (m_mediaSource) {
                 if (!m_mediaSource->attachToElement(this)) {
                     // Forget our reference to the MediaSource, so we leave it alone
                     // while processing remainder of load failure.
                     m_mediaSource = nullptr;
                     attemptLoad = false;
                 }
             }
         }
     }
 
     bool canLoadResource = source.isMediaStream() || canLoadURL(url, contentType);
     if (attemptLoad && canLoadResource) {
         ASSERT(!webMediaPlayer());
 
-        if (effectivePreloadType() == WebMediaPlayer::PreloadNone) {
+        // Conditionally defer the load if effective preload is 'none'.
+        // Skip this optional deferral for MediaStream sources or any blob URL,
+        // including MediaSource blob URLs.
+        if (!isStreamOrBlobUrl && effectivePreloadType() == WebMediaPlayer::PreloadNone) {
             WTF_LOG(Media, "HTMLMediaElement::loadResource(%p) : Delaying load because preload == 'none'", this);
             deferLoad();
         } else {
             startPlayerLoad();
         }
     } else {
         mediaLoadingFailed(WebMediaPlayer::NetworkStateFormatError);
     }
 
     // If there is no poster to display, allow the media engine to render video frames as soon as
@@ skipping 2814 matching lines @@
 
 IntRect HTMLMediaElement::AutoplayHelperClientImpl::absoluteBoundingBoxRect() const
 {
     IntRect result;
     if (LayoutObject* object = m_element->layoutObject())
         result = object->absoluteBoundingBoxRect();
     return result;
 }
 
 } // namespace blink