Once the patch for bug 105199 has gone in, we can remove the visible tile buffer which has been a source of complexity and memory usage, and can now be replaced with different functionality. Yay! Patch below.
Created attachment 179944 [details] Patch
Comment on attachment 179944 [details] Patch Dependent on bug 105199
Comment on attachment 179944 [details] Patch Clearing flags on attachment: 179944 Committed r138028: <http://trac.webkit.org/changeset/138028>
All reviewed patches have been landed. Closing bug.