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To check that the expected histograms are uploaded, I wanted a way
to see the uploaded histograms. With this CL, uploaded histogram
data is logged to the console. Can be enabled with
-vmodule=net_metrics_log_uploader=2. This is debug-build only.


Change-Id: I9c889e5e959c684b4a94b17cb53b687a48d6eebf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2218312Reviewed-by: Ilya Sherman <isherman@chromium.org>
Commit-Queue: Dan H <harringtond@chromium.org>
Cr-Commit-Position: refs/heads/master@{#774817}