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Add Finch Experiments info aka variations crash keys to Webview minidump. The keys are "variations" and "num-experiments".

Bug: 758450
Change-Id: Ib3bc7b872c0ff88eb404595496a9084f1d123ea9
Reviewed-on: https://chromium-review.googlesource.com/c/1305953
Commit-Queue: Hazem Ashmawy <hazems@chromium.org>
Reviewed-by: Tobias Sargeant <tobiasjs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604622}