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Some tests need to run the message loop until a particular condition
becomes true, but have no direct signal from the code under test to
use to trigger the check & terminate the run.

RunUntilConditionForTest() runs the loop and repeatedly calls a supplied
callback until it returns true, or the Run()-timeout expires. The helper
returns true if the condition was met before the timeout.

Bug: 1021777, 976740
Change-Id: I18f887431a68cb73cc77a445f3b915284b111cb4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2033162
Commit-Queue: Wez <wez@chromium.org>
Auto-Submit: Wez <wez@chromium.org>
Reviewed-by: Gabriel Charette <gab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738222}