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This CL brings WebAssembly UMA metrics to the v8-browsing benchmark in
Telemetry.

R=mythria@chromium.org, clemensb@chromium.org

Bug: chromium:1084929
Change-Id: I28e72378774c3d599da1ad670ba036a3f0ea84e0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2497164Reviewed-by: Mythri Alle <mythria@chromium.org>
Reviewed-by: John Chen <johnchen@chromium.org>
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#820779}