[MediaElement] Allow preloading for non-network scheme src

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 49afa3146a37a67f9947b9891dd9ee4d4341cb18..c69d863d3871ad78ab74a16dfcb9b10dff97726e 100644
--- a/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
@@ -2070,10 +2070,13 @@ WebMediaPlayer::Preload HTMLMediaElement::preloadType() const {
     return WebMediaPlayer::PreloadNone;
   }
 
-  // Force preload to 'none' on Data Saver and for low end devices.
+  // If the source scheme is requires network, force preload to 'none' on Data
+  // Saver and for low end devices.
   if (document().settings() &&
       (document().settings()->dataSaverEnabled() ||
-       document().settings()->forcePreloadNoneForMediaElements())) {
+       document().settings()->forcePreloadNoneForMediaElements()) &&
+      (m_currentSrc.protocol() != "blob" && m_currentSrc.protocol() != "data" &&
+       m_currentSrc.protocol() != "file")) {
     UseCounter::count(document(),
                       UseCounter::HTMLMediaElementPreloadForcedNone);
     return WebMediaPlayer::PreloadNone;