Enable user gesture requirement for autoplay experiment.

third_party/WebKit/Source/core/html/AutoplayExperimentHelper.h

 // 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.
 
 #ifndef AutoplayExperimentHelper_h
 #define AutoplayExperimentHelper_h
 
 #include "core/page/Page.h"
 #include "platform/Timer.h"
 #include "platform/geometry/IntRect.h"
@@ skipping 136 matching lines @@
     void loadMethodCalled();
     void mutedChanged();
     void positionChanged(const IntRect&);
     void updatePositionNotificationRegistration();
     void recordSandboxFailure();
     void loadingStarted();
     void playbackStarted();
     void playbackStopped();
     void initialPlayWithUserGesture();
 
+    // Returns true if and only if any experiment is enabled (i.e., |m_mode|
+    // is not ExperimentOff).
+    bool isExperimentEnabled();
+
     // Clean up.  For Oilpan, this means "early in HTMLMediaElement's dispose".
     // For non-Oilpan, just delete the object.
     void dispose();
 
     // Remove the user gesture requirement, and record why.  If there is no
     // gesture requirement, then this does nothing.
     void removeUserGestureRequirement(AutoplayMetrics);
 
     // Set the position to the current view's position, and
     void triggerAutoplayViewportCheckForTesting();
@@ skipping 144 matching lines @@
 inline AutoplayExperimentHelper::Mode& operator|=(AutoplayExperimentHelper::Mode& a,
     const AutoplayExperimentHelper::Mode& b)
 {
     a = static_cast<AutoplayExperimentHelper::Mode>(static_cast<int>(a) | static_cast<int>(b));
     return a;
 }
 
 } // namespace blink
 
 #endif // AutoplayExperimentHelper_h