Fetch and cache the number of cores before sandbox initialization. This is necessary on Linux since trying to get this information after the sandbox has been enabled, will give incorrect information (always 1).
Fetch and cache the number of cores before sandbox initialization.
This is necessary on Linux since trying to get this information after the sandbox has been enabled, will give incorrect information (always 1).

BUG=176522,521621

Review URL: https://codereview.chromium.org/1291583003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#343704}

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