In RemoteLayerBackingStore, group makeFrontBufferNonVolatile() and swapToValidFrontBuffer() into a single function
Created attachment 454533 [details] Patch
Committed r291214 (248369@main): <https://commits.webkit.org/248369@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 454533 [details].
<rdar://problem/90210252>