Autoplay: disable muted video autoplay if data saver is on.

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 48ac87082a865889a7cb762c0b8c884fa9adde03..585b1956a9766988a81217370391af7e3b29d9eb 100644
--- a/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
@@ -3664,8 +3664,13 @@ bool HTMLMediaElement::isGestureNeededForPlayback()
     if (!m_lockedPendingUserGesture)
         return false;
 
-    if (muted() && RuntimeEnabledFeatures::videosAsImagesEnabled())
+    // We want to allow muted video to autoplay if:
+    // - the flag is enabled;
+    // - Data Saver is not enabled;
+    if (muted() && RuntimeEnabledFeatures::videosAsImagesEnabled()
+        && !(document().settings() && document().settings()->dataSaverEnabled())) {
         return false;
+    }
 
     if (m_autoplayHelper->isGestureRequirementOverridden())
         return false;