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Adds basic usage metrics to the main API methods. This will give us a
basic quantitative view on how the API is used during Origin Trial.

Fixed: 1116107
Change-Id: I79e2717f49b645eac5f065c7b5346ca10b3521ff
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2354607
Commit-Queue: Olivier Yiptong <oyiptong@chromium.org>
Reviewed-by: Martin Barbella <mbarbella@chromium.org>
Reviewed-by: Joshua Bell <jsbell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#797958}