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Unlike WebView it looks like VariationsService is a better fit than a
custom java fetcher since we expect to have network permissions.

Note without backend changes this patch should be a NOP since no trials
currently target WebLayer as a platform.

WebLayerFieldTrials is a stub and as such it doesn't currently
support WebLayer specific trials. AFAIK this doesn't prevent a trial's
config specifying WebLayer only.

The variations service itself has plenty of tests but there doesn't seem
to be any tests for the equivalent hookup code in Chrome/WebView.

Bug: 1025612
Change-Id: Ib7dfe64455a323cfafd160b2612f148872e0fa25
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2028770
Commit-Queue: Alex Clarke <alexclarke@chromium.org>
Auto-Submit: Alex Clarke <alexclarke@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Reviewed-by: Richard Coles <torne@chromium.org>
Reviewed-by: Tobias Sargeant <tobiasjs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738518}