Add support for standalone ASAN build. Adds tools/memory to standalone DEPS. Bug: angleproject:3897 Change-Id: I744e5816156e6e1df78033201eb7fd56083c1bc6 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1787997 Reviewed-by: Jonah Ryan-Davis <jonahr@google.com> Commit-Queue: Jamie Madill <jmadill@chromium.org>