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This implements site isolation for the preloaded origin list on Android,
along with handling the memory threshold policy. The next step is to
implement the dynamic detection of password sites.

Bug: 1058364
Change-Id: I12b93c07bbb237a914f1f80704dbb049e5412db7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2236064
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#776611}