[blink] Record filereader metrics using //base/metrics helpers.
This also converts the various metric enums to be scoped enums, which allows: - clang to enforce kMaxValue correctness - autodeduction of the max value by UMA_HISTOGRAM_ENUMERATION. Bug: 742517, 1047547 Change-Id: I3d7c4476d0001fd9984527918f7c2494332653a7 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2506359 Commit-Queue: Daniel Cheng <dcheng@chromium.org> Commit-Queue: Victor Costan <pwnall@chromium.org> Auto-Submit: Daniel Cheng <dcheng@chromium.org> Reviewed-by:Victor Costan <pwnall@chromium.org> Cr-Commit-Position: refs/heads/master@{#822089}
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