Include viewport visibility checks for autoplay experiment.

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

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "core/html/AutoplayExperimentConfig.h"
 
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
 AutoplayExperimentConfig::Mode AutoplayExperimentConfig::fromString(const String& mode)
 {
     AutoplayExperimentConfig::Mode value = AutoplayExperimentConfig::Mode::Off;
     if (mode.contains("-forvideo"))
         value |= AutoplayExperimentConfig::Mode::ForVideo;
     if (mode.contains("-foraudio"))
         value |= AutoplayExperimentConfig::Mode::ForAudio;
+    if (mode.contains("-ifpagevisible"))
+        value |= AutoplayExperimentConfig::Mode::IfPageVisible;
+    if (mode.contains("-ifviewport"))
+        value |= AutoplayExperimentConfig::Mode::IfViewport;
     if (mode.contains("-ifmuted"))
         value |= AutoplayExperimentConfig::Mode::IfMuted;
     if (mode.contains("-ifmobile"))
         value |= AutoplayExperimentConfig::Mode::IfMobile;
     if (mode.contains("-playmuted"))
         value |= AutoplayExperimentConfig::Mode::PlayMuted;
 
     return value;
 }
 
 } // namespace blink