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GWP-ASan is a debug allocator intended to find memory errors in the
wild. In order to detect as many as bugs as possible, it should start as
early as possible, e.g. soon after it's dependency, FeatureList, has
been initialized. Since content/ doesn't call into ChromeMainDelegate
for child processes after FeatureList has been initialized, create a new
delegate method for post-FeatureList initialization and enable GWP-ASan
at that point.

Bug: 896019
Change-Id: I9c081602cd32a71d5d9eb774bd9818757d9b7e95
Reviewed-on: https://chromium-review.googlesource.com/c/1343347Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611041}