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I wasn't able to see my LOG(INFO) output when running the test
binary with `logcat -v` added, but a colleague suggested `adb logcat`,
which worked. This CL updates the Android debugging docs to suggest
`adb logcat` for viewing printed log lines.

Change-Id: Iec2152b9fb5ca265239e7515482ff7be823eddca
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2023390
Commit-Queue: David Van Cleve <davidvc@chromium.org>
Reviewed-by: Peter Wen <wnwen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#736386}