Oilpan: tidy up AutoplayExperimentHelper.

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 49 matching lines @@
     AnyPlaybackStarted = 11,
     // Some play, whether user initiated or not, paused.
     AnyPlaybackPaused = 12,
     // Some playback, whether user initiated or not, bailed out early.
     AnyPlaybackBailout = 13,
 
     // This enum value must be last.
     NumberOfAutoplayMetrics,
 };
 
-class AutoplayExperimentHelper {
+class AutoplayExperimentHelper final {
+    DISALLOW_NEW_EXCEPT_PLACEMENT_NEW();
 public:
-    AutoplayExperimentHelper(HTMLMediaElement&);
+    explicit AutoplayExperimentHelper(HTMLMediaElement&);
     ~AutoplayExperimentHelper();
 
     void becameReadyToPlay();
     void playMethodCalled();
     void pauseMethodCalled();
     void mutedChanged();
     void positionChanged(const IntRect&);
     void updatePositionNotificationRegistration();
 
     void triggerAutoplayViewportCheckForTesting();
@@ skipping 13 matching lines @@
         // Restrict gestureless autoplay to audio-less or muted media.
         IfMuted       = 1 << 4,
         // Restrict gestureless autoplay to sites which contain the
         // viewport tag.
         IfMobile      = 1 << 5,
         // If gestureless autoplay is allowed, then mute the media before
         // starting to play.
         PlayMuted     = 1 << 6,
     };
 
+    DEFINE_INLINE_TRACE()
+    {
+        visitor->trace(m_element);
+    }
+
 private:
     // Register to receive position updates, if we haven't already.  If we
     // have, then this does nothing.
     void registerForPositionUpdatesIfNeeded();
 
     // Un-register for position updates, if we are currently registered.
     void unregisterForPositionUpdatesIfNeeded();
 
     // Return true if any only if this player meets (most) of the eligibility
     // requirements for the experiment to override the need for a user
@@ skipping 16 matching lines @@
     // going to start playback.  This doesn't actually start playback, since
     // there are several different cases.
     void prepareToPlay(AutoplayMetrics);
 
     // Process a timer for checking visibility.
     void viewportTimerFired(Timer<AutoplayExperimentHelper>*);
 
     // Return our media element's document.
     Document& document() const;
 
+    HTMLMediaElement& element() const;
+
     inline bool enabled(Mode mode) const
     {
         return ((int)m_mode) & ((int)mode);
     }
 
     Mode fromString(const String& mode);
 
-private:
-    HTMLMediaElement& m_element;
+    RawPtrWillBeMember<HTMLMediaElement> m_element;
 
     Mode m_mode;
 
     // Autoplay experiment state.
     // True if we've received a play() without a pause().
     bool m_playPending : 1;
 
     // Are we registered with the view for position updates?
     bool m_registeredWithLayoutObject : 1;
 
@@ skipping 14 matching lines @@
     const AutoplayExperimentHelper::Mode& b)
 {
     a = static_cast<AutoplayExperimentHelper::Mode>(static_cast<int>(a) | static_cast<int>(b));
     return a;
 }
 
 
 } // namespace blink
 
 #endif // AutoplayExperimentHelper_h