Use data saver information to decide whether to preload.

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 1982 matching lines @@
 }
 
 void HTMLMediaElement::setPreload(const AtomicString& preload)
 {
     MEDIA_LOG << "setPreload(" << (void*)this << ", " << preload << ")";
     setAttribute(preloadAttr, preload);
 }
 
 WebMediaPlayer::Preload HTMLMediaElement::preloadType() const
 {
-    // Force preload to none for cellular connections.
-    if (networkStateNotifier().isCellularConnectionType()) {
+    // Force preload to none for cellular connections or when data saver is explicitly set.
+    if (networkStateNotifier().isCellularConnectionType()
+        || (document().settings() && document().settings()->dataSaverEnabled())) {
         UseCounter::count(document(), UseCounter::HTMLMediaElementPreloadForcedNone);
         return WebMediaPlayer::PreloadNone;
     }
 
     const AtomicString& preload = fastGetAttribute(preloadAttr);
     if (equalIgnoringCase(preload, "none")) {
         UseCounter::count(document(), UseCounter::HTMLMediaElementPreloadNone);
         return WebMediaPlayer::PreloadNone;
     }
     if (equalIgnoringCase(preload, "metadata")) {
@@ skipping 18 matching lines @@
     return WebMediaPlayer::PreloadAuto;
 }
 
 String HTMLMediaElement::effectivePreload() const
 {
     return preloadTypeToString(effectivePreloadType());
 }
 
 WebMediaPlayer::Preload HTMLMediaElement::effectivePreloadType() const
 {
-    if (autoplay())
+    if (autoplay() && !isGestureNeededForPlayback())
         return WebMediaPlayer::PreloadAuto;
 
     WebMediaPlayer::Preload preload = preloadType();
     if (m_ignorePreloadNone && preload == WebMediaPlayer::PreloadNone)
         return WebMediaPlayer::PreloadMetaData;
 
     return preload;
 }
 
 ScriptPromise HTMLMediaElement::playForBindings(ScriptState* scriptState)
@@ skipping 1959 matching lines @@
 
 IntRect HTMLMediaElement::AutoplayHelperClientImpl::absoluteBoundingBoxRect() const
 {
     IntRect result;
     if (LayoutObject* object = m_element->layoutObject())
         result = object->absoluteBoundingBoxRect();
     return result;
 }
 
 } // namespace blink