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webview: document approach to compatibility

Change-Id: I1f42684060ee5416c8e68ad639e37f69b943c7e6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2590868
Auto-Submit: Richard Coles <torne@chromium.org>
Reviewed-by: Nate Fischer <ntfschr@chromium.org>
Commit-Queue: Nate Fischer <ntfschr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#837738}