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I had forgotten to initialize pending_precondition_check_count_; running the
component tests with asan highlighted that.

Bug: 882901
Change-Id: Ia9621e80946da39e3d6ecb8e8c98a09beb4a76e2
Reviewed-on: https://chromium-review.googlesource.com/1219709Reviewed-by: Ganggui Tang <gogerald@chromium.org>
Commit-Queue: Stephane Zermatten <szermatt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#590417}