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The MemoryDumpProvider API uses 64-bit integers. For consistency, use
SQLite's 64-bit API (sqlite_status64) to obtain memory usage statistics
from SQLite.

This CL also documents the SQLite build configuration setting assumed by
the memory usage reporting code. The value needed by the memory
reporting code is (currently) the default. However, the SQLite
docs [1] recommend a different value, so documenting our needs makes it
less likely that we'll accidentally end up with an incorrect
configuration.

Change-Id: I15217e11bce8d167dce65db345ddf78d21148144
Reviewed-on: https://chromium-review.googlesource.com/1146293Reviewed-by: Chris Mumford <cmumford@chromium.org>
Commit-Queue: Victor Costan <pwnall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577260}