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Long-lived allocations can consume all of GWP-ASan's memory early,
resulting in uneven sampling over the process' lifetime. Report how many
total allocations (e.g. taking into account the the sampling frequency)
it took before OOM. Break these reports out by allocator and process
since behavior varies significantly based on these factors.

This metric will help measure whether we are frequently running out of
allocations early for a given allocator/process and will help track
future memory improvements.

Bug: 963711
Change-Id: Ifef2d61ee3fb589a4b55fcf2b93f7f64096e43f1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1628288
Auto-Submit: Vlad Tsyrklevich <vtsyrklevich@chromium.org>
Reviewed-by: Brian White <bcwhite@chromium.org>
Reviewed-by: Vitaly Buka <vitalybuka@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Commit-Queue: Vlad Tsyrklevich <vtsyrklevich@chromium.org>
Cr-Commit-Position: refs/heads/master@{#663953}