Add -ifsameorigin to 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 105 matching lines @@
         virtual void removeUserGestureRequirement() = 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;
         virtual String autoplayExperimentMode() const = 0;
+        virtual LocalFrame* frame() const = 0;
 
         // LayoutObject
         virtual void setRequestPositionUpdates(bool) = 0;
         virtual IntRect absoluteBoundingBoxRect() const = 0;
 
         DEFINE_INLINE_VIRTUAL_TRACE() { }
     };
 
     static AutoplayExperimentHelper* create(Client* client)
     {
@@ skipping 38 matching lines @@
         // Restrict gestureless autoplay to media that is entirely visible in
         // the viewport.
         IfViewport        = 1 << 3,
         // Restrict gestureless autoplay to media that is partially visible in
         // 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,
+        IfMobile          = 1 << 5,
+        // Restrict gestureless autoplay to sites which are from the same origin
+        // as the top-level frame.
+        IfSameOrigin      = 1 << 6,
+        // When combined with IfSameOrigin, allow muted to override the same
+        // origin check.  Else, this does nothing.
+        OrMuted           = 1 << 7,
         // If gestureless autoplay is allowed, then mute the media before
         // starting to play.
-        PlayMuted         = 1 << 7,
+        PlayMuted         = 1 << 8,
     };
 
     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 107 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