Allow muted third-party autoplay with -ormuted experiment option.

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 95 matching lines @@
         virtual ~Client() {}
 
         // HTMLMediaElement
         virtual double currentTime() const = 0;
         virtual double duration() const = 0;
         virtual bool paused() const = 0;
         virtual bool ended() const = 0;
         virtual bool muted() const = 0;
         virtual void setMuted(bool) = 0;
         virtual void playInternal() = 0;
+        virtual void pauseInternal() = 0;
         virtual bool isLockedPendingUserGesture() const = 0;
         virtual void unlockUserGesture() = 0;
         virtual void recordAutoplayMetric(AutoplayMetrics) = 0;
         virtual bool shouldAutoplay() = 0;
         virtual bool isHTMLVideoElement() const = 0;
         virtual bool isHTMLAudioElement() const = 0;
 
         // Document
         virtual bool isLegacyViewportType() = 0;
         virtual PageVisibilityState pageVisibilityState() const = 0;
@@ skipping 14 matching lines @@
     {
         return new AutoplayExperimentHelper(client);
     }
 
     ~AutoplayExperimentHelper();
 
     void becameReadyToPlay();
     void playMethodCalled();
     void pauseMethodCalled();
     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).
@@ skipping 38 matching lines @@
         // the viewport.
         IfPartialViewport = 1 << 4,
         // Restrict gestureless autoplay to audio-less or muted media.
         IfMuted           = 1 << 5,
         // Restrict gestureless autoplay to sites which contain the
         // viewport tag.
         IfMobile          = 1 << 6,
         // Restrict gestureless autoplay to sites which are from the same origin
         // as the top-level frame.
         IfSameOrigin      = 1 << 7,
+        // Extend IfSameOrigin to allow autoplay of cross-origin elements if
+        // they're muted.  This has no effect on same-origin or if IfSameOrigin
+        // isn't enabled.
+        OrMuted           = 1 << 8,
         // If gestureless autoplay is allowed, then mute the media before
         // starting to play.
-        PlayMuted         = 1 << 8,
+        PlayMuted         = 1 << 9,
     };
 
     DEFINE_INLINE_TRACE() { visitor->trace(m_client); }
 
 private:
     explicit AutoplayExperimentHelper(Client*);
 
     // Register to receive position updates, if we haven't already.  If we
     // have, then this does nothing.
     void registerForPositionUpdatesIfNeeded();
@@ skipping 119 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