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This metric measures code loading time for WebLayer, and reuses the
logic from the WebView startup test.

Bug: 1137468
Change-Id: I9045bb47b119470881c1500650a9ed9127295afe
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2466482
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Reviewed-by: John Chen <johnchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816418}