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The buffer contents may be uninitialized on some platforms. Ensure that
it is cleared before being displayed.

Change-Id: I55007e0728852d38911515019a2a7a3640ef613c
Bug: b:168735625
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2413179
Commit-Queue: Drew Davenport <ddavenport@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813182}