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These histograms measure WebLayer startup before WebLayerImpl is loaded,
which we were not measureing before. This will help tell if something
here is contributing to slow startup.

Bug: 1137468
Change-Id: I3e84fc399cf460d60d2e7445326493c528c09178
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2466264
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816590}