Add DCHECKs to trap zero Resource process-ids and handles.
Add DCHECKs to trap zero Resource process-ids and handles.

TaskManager is written with the assumption that Resource::GetProcess()
never returns zero handles, and that base::GetProcId() never returns
a zero process-id for any current Resource process handle.

These DCHECKs should make it easier to spot when things have regressed.

BUG=354716

Review URL: https://codereview.chromium.org/884533002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#337932}

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