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GWP-ASan [1] is a probabilistic heap memory-error detector meant to be
deployed in-the-wild. Add calls to initialize GWP-ASan during WebView
initialization (gated by feature flags) and white list the annotations
GWP-ASan uses to communicate with the crash handler.

[1] https://chromium.googlesource.com/chromium/src/+/master/docs/gwp_asan.md

CQ-DEPEND=chromium:1757160

Bug: 973167
Change-Id: Ib950dadc957dc4e4c2356a070fa8c7ec244299f4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1757430Reviewed-by: Richard Coles <torne@chromium.org>
Commit-Queue: Vlad Tsyrklevich <vtsyrklevich@chromium.org>
Cr-Commit-Position: refs/heads/master@{#689070}