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No change to production logic. This adds a test to verify we collect
renderer process histograms and merge them with browser process
histograms (at which point we can be confident they'll be included in
the next UMA log).

Fixed: 1112018
Test: run_webview_instrumentation_test_apk -f AwMetricsIntegrationTest.*
Change-Id: I2a4cd8328061fea6e67f9f4fb43f1fdd07669525
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2473807
Commit-Queue: Nate Fischer <ntfschr@chromium.org>
Auto-Submit: Nate Fischer <ntfschr@chromium.org>
Reviewed-by: Bo <boliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#818037}