Add UseCounters for Conversion Measurement API
Adds Blink Usecounters for impression registration, conversion registration, and a composite usecounter for both of those events. These are necessary to measure the percentage of page loads using the API, for running an origin trial. A new test harness is added in the chrome/ layer to verify that metrics are recorded as expected. Bug: 1109079 Change-Id: I2f70bb3a2eac60ff45a5654169b4db959fd1d3f4 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2314843 Commit-Queue: John Delaney <johnidel@chromium.org> Reviewed-by:Nate Chapin <japhet@chromium.org> Reviewed-by:
Nico Weber <thakis@chromium.org> Reviewed-by:
Charlie Harrison <csharrison@chromium.org> Cr-Commit-Position: refs/heads/master@{#792856}
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