Bug 1499903 - part3 : change 'mLogicallySeeking' to Watchable r=chunmin

Nobody is mirroring to 'mLogicallySeeking', so we can just use Watchable instead.

Differential Revision: https://phabricator.services.mozilla.com/D9642

--HG--
extra : moz-landing-system : lando

dom/media/MediaDecoder.cpp

@@ -275,6 +275,7 @@ MediaDecoder::MediaDecoder(MediaDecoderInit& aInit)
   , mForcedHidden(false)
   , mHasSuspendTaint(aInit.mHasSuspendTaint)
   , mPlaybackRate(aInit.mPlaybackRate)
+  , mLogicallySeeking(false, "MediaDecoder::mLogicallySeeking")
   , INIT_MIRROR(mBuffered, TimeIntervals())
   , INIT_MIRROR(mCurrentPosition, TimeUnit::Zero())
   , INIT_MIRROR(mStateMachineDuration, NullableTimeUnit())
@@ -283,7 +284,6 @@ MediaDecoder::MediaDecoder(MediaDecoderInit& aInit)
   , INIT_CANONICAL(mPreservesPitch, aInit.mPreservesPitch)
   , INIT_CANONICAL(mLooping, aInit.mLooping)
   , INIT_CANONICAL(mPlayState, PLAY_STATE_LOADING)
-  , INIT_CANONICAL(mLogicallySeeking, false)
   , INIT_CANONICAL(mSameOriginMedia, false)
   , INIT_CANONICAL(mMediaPrincipalHandle, PRINCIPAL_HANDLE_NONE)
   , mVideoDecodingOberver(new BackgroundVideoDecodingPermissionObserver(this))

dom/media/MediaDecoder.h

@@ -602,6 +602,9 @@ protected:
   // PlaybackRate and pitch preservation status we should start at.
   double mPlaybackRate;
 
+  // True if the decoder is seeking.
+  Watchable<bool> mLogicallySeeking;
+
   // Buffered range, mirrored from the reader.
   Mirror<media::TimeIntervals> mBuffered;
 
@@ -634,9 +637,6 @@ protected:
   // This can only be changed on the main thread.
   PlayState mNextState = PLAY_STATE_PAUSED;
 
-  // True if the decoder is seeking.
-  Canonical<bool> mLogicallySeeking;
-
   // True if the media is same-origin with the element. Data can only be
   // passed to MediaStreams when this is true.
   Canonical<bool> mSameOriginMedia;
@@ -665,10 +665,6 @@ public:
     return &mLooping;
   }
   AbstractCanonical<PlayState>* CanonicalPlayState() { return &mPlayState; }
-  AbstractCanonical<bool>* CanonicalLogicallySeeking()
-  {
-    return &mLogicallySeeking;
-  }
   AbstractCanonical<bool>* CanonicalSameOriginMedia()
   {
     return &mSameOriginMedia;