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The tests were not initializing the font correctly nor were they
waiting for it to load. This should fix those issues, however the
2d.text.measure.width.space test still fails because of how collapsing
whitespace works. Not sure if this a bug in the test or implementation.

BUG=1066953

Change-Id: I2f0b81da891e6c701b1c9aa7d8d871615ab0ca28
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2132674Reviewed-by: Fernando Serboncini <fserb@chromium.org>
Reviewed-by: Robert Ma <robertma@chromium.org>
Commit-Queue: Dave Tapuska <dtapuska@chromium.org>
Cr-Commit-Position: refs/heads/master@{#755917}