As in bug 223118 comment 17; we want to only send the image to the GPU process when the image actually changed to avoid unnecessary overhead.
We could deal with the check in the MediaSessionManagerCocoa so that the implementation details are removed from MediaElementSession.
Created attachment 423846 [details]
Created attachment 423847 [details]
EWS failure (crash) doesn't appear to hit the code path touched by this change.
Comment on attachment 423847 [details]
r=me once the bots are happy
Committed r274873: <https://commits.webkit.org/r274873>
All reviewed patches have been landed. Closing bug and clearing flags on attachment 423847 [details].