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|cell_size| was not initialized during the test which expected it to be. The parameter is optional according to idl, but in this context, it probably should be initialized.

Tested locally on an msan build.

Original change
https://chromium-review.googlesource.com/c/chromium/src/+/2206198

TBR=dtseng@chromium.org

Change-Id: Ie623a55ad298c9e6522102338fe7357dd28c521e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2208024Reviewed-by: David Tseng <dtseng@chromium.org>
Commit-Queue: David Tseng <dtseng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#769988}