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This CL allows the CheckedPtr constructor to quickly skip unsupported
pointers.

Change-Id: Ibabb8802f4feb3734e1e7740fd86bd8df9a4e657
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2379831Reviewed-by: Bartek Nowierski <bartekn@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Sergei Glazunov <glazunov@google.com>
Cr-Commit-Position: refs/heads/master@{#803067}