Update memory README.

Updated the list of on-going projects. Updated the metrics section.

Bug: 
Change-Id: Ic981596ce74aca0afdcdc7ceea95dcccab123ad0
Reviewed-on: https://chromium-review.googlesource.com/795430
Reviewed-by: Brett Wilson <brettw@chromium.org>
Commit-Queue: Erik Chen <erikchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#520124}
1 file changed