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This adds the following metric:

BackgroundFetch.RatioOfIdealToChosenIconSize

Bug: 877512
Change-Id: Id4289b13178ca9e3bd76e1ea9371f778788b5699
Reviewed-on: https://chromium-review.googlesource.com/1199591
Commit-Queue: Mugdha Lakhani <nator@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Reviewed-by: Rayan Kanso <rayankans@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Peter Beverloo <peter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589496}