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No change to production logic.

This adds FlagOverrideHelper to help apply batches of commandline flags
and base::Features to the CommandLine singleton. It also is responsible
for mapping flag names to Flag instances, resolving a TODO. This class
is currently not used in production, but will be used in a future CL to
apply flag overrides indicated from the developer UI.

This adds robolectric unit tests to cover several corner cases.

Bug: 981143
Test: run_android_webview_junit_tests -f *FlagOverrideHelperTest#*
Change-Id: Ie982fc66aa62bf3d51ffe74c04c708b435157261
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1952032
Commit-Queue: Nate Fischer <ntfschr@chromium.org>
Reviewed-by: Richard Coles <torne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#722627}