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 5d9fc80c972c70e2d16df7f56ef108ce6aa25aa6..efd6285906520d5d0f5f4bfa8bb33d88841ce850 100644
--- a/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
@@ -995,7 +995,8 @@ void HTMLMediaElement::loadResource(const WebMediaPlayerSource& source, ContentT
 
     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);
@@ -1017,7 +1018,10 @@ void HTMLMediaElement::loadResource(const WebMediaPlayerSource& source, ContentT
     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 {