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I needed to fix the IsolatedSplitsSynthetic trial to only log for
monochrome, and thought it might be useful to have this as well. This
will let us filter UMA data by the WebView APK type, and can help us
answer the age old question of how many users have standalone WebView on
N+.

Bug: 1150162
Change-Id: I4cc97632f514b0c54b07e205c33dd1c1d3703071
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2618625Reviewed-by: Richard Coles <torne@chromium.org>
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842113}