Helps to diagnose perf bugs where resources are over-allocated. Also
can be useful to evaluate caching strategies.

Bug: angleproject:4517
Change-Id: I48df5a09fbc394fa0b1712fa8cf28a179665e6e7
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2159293
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Tobin Ehlis <tobine@google.com>