GWP-ASan: Use more memory in the browser process

The browser process is particularly long-lived and has a significant
proportion of long-lived allocations. Both of these factors make it much
more likely that GWP-ASan will run out of allocations by sampling
long-lived allocations early, and not catch bugs that occur later in the
process lifetime. Increase the amount of allocations we can sample in
the browse process (and hence the amount of memory we use) to accomodate
for these challenges.

Bug: 937020
Change-Id: I81e8f9da90367ff03a566cdb2ffb305a4fa49935
Reviewed-on: https://chromium-review.googlesource.com/c/1495799
Commit-Queue: Vlad Tsyrklevich <vtsyrklevich@chromium.org>
Reviewed-by: Vitaly Buka <vitalybuka@chromium.org>
Reviewed-by: Carlos Pizano <cpu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#637034}
3 files changed