GitLab

Previously CommandBuffer sizes accurately captured the amount of
gpu memory used by Chrome.  However, recent changes like OOPR and shared
images have spread this memory over multiple categories.

Add a single UMA/UKM to report this memory so that we can accurately
track it in the wild.

Bug: 960499
Change-Id: I9aea6bd93dffc2d226f2e3f5c72696ad37942960
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1611862
Commit-Queue: enne <enne@chromium.org>
Reviewed-by: Robert Kaplow (slow) <rkaplow@chromium.org>
Reviewed-by: Eric Karl <ericrk@chromium.org>
Reviewed-by: Nik Bhagat <nikunjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#664382}