To M51: MSE, MS, and any blob URL: Ignore preload 'none' on resource fetching

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

Index: third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
diff --git a/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp b/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
index 32c2ce5f56607a0f61750cc17d6ce97b1ffa72ca..963c7d6b2efac7f249ab4878941435d6a9f1ac88 100644
--- a/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
@@ -1027,7 +1027,8 @@ void HTMLMediaElement::loadResource(const KURL& url, ContentType& contentType)
 
     bool attemptLoad = true;
 
-    if (url.protocolIs(mediaSourceBlobProtocol)) {
+    bool isStreamOrBlobUrl = url.protocolIs(mediaSourceBlobProtocol);
+    if (isStreamOrBlobUrl) {
         if (isMediaStreamURL(url.getString())) {
             m_autoplayHelper->removeUserGestureRequirement(GesturelessPlaybackEnabledByStream);
         } else {
@@ -1047,7 +1048,10 @@ void HTMLMediaElement::loadResource(const KURL& url, ContentType& contentType)
     if (attemptLoad && canLoadURL(url, contentType)) {
         ASSERT(!webMediaPlayer());
 
-        if (effectivePreloadType() == WebMediaPlayer::PreloadNone) {
+        // Conditionally defer the load if effective preload is 'none'.
+        // Skip this optional deferral for any blob URL, including MediaStream
+        // and MediaSource blob URLs.
+        if (!isStreamOrBlobUrl && effectivePreloadType() == WebMediaPlayer::PreloadNone) {
             WTF_LOG(Media, "HTMLMediaElement::loadResource(%p) : Delaying load because preload == 'none'", this);
             deferLoad();
         } else {