Track vulkan memory allocations in UMA.

We track the total amount of memory allocated and the percentage of the
allocated memory that is used.

Bug: skia:10871
Change-Id: I4aa120a3545d215cf42430aa6a73e924118f1dbc
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/329963
Commit-Queue: Greg Daniel <egdaniel@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
3 files changed