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PartitionDirectMap and AllocNewSlotSpan have been reporting things
inconsistently. After this CL, the metrics will have the following
(consistent) meaning:
1. total_size_of_super_pages - total virtual address space for normal
   bucket super pages
2. total_size_of_direct_mapped_pages - total virtual address space for
   direct map regions
3. total_size_of_committed_pages - total committed pages for slots
   (doesn't include metadata, bitmaps, or any data outside or regions
   described in #1 and #2)

Change-Id: I1ac1b3044d15b33dcbd506f133d1fe7fa322277f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2532542
Commit-Queue: Bartek Nowierski <bartekn@chromium.org>
Reviewed-by: Benoit L <lizeb@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Auto-Submit: Bartek Nowierski <bartekn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827564}