[webkit-reviews] review requested: [Bug 78976] [mac] BackingStore::scroll() unnecessarily copies pixels around : [Attachment 127720] Maintain a mapping from backing store coordinates to client coordinates in the most recently scrolled rect

[bugzilla-daemon at webkit.org]

mitz at webkit.org has asked  for review:
Bug 78976: [mac] BackingStore::scroll() unnecessarily copies pixels around
https://bugs.webkit.org/show_bug.cgi?id=78976

Attachment 127720: Maintain a mapping from backing store coordinates to client
coordinates in the most recently scrolled rect
https://bugs.webkit.org/attachment.cgi?id=127720&action=review