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We'd like to use some SQLite features currently disabled in Chrome
in a developer trace-analyzing tool called trace_processor_shell.
As discussed on the thread [1], it's undesirable to enable them
Chrome-wide.

This CL adds an "sqlite_dev" build target and third_party/sqlite/dev
include directory with a separate sqlite library that has most of the
features enabled.

[1] https://groups.google.com/a/chromium.org/g/storage-dev/c/OkwAfpYWAa0

Bug: b/150127983, b/150125501
Change-Id: If328bb737679b6d352904bcb543bc6ed1c522b90
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2082389Reviewed-by: Victor Costan <pwnall@chromium.org>
Commit-Queue: Mikhail Khokhlov <khokhlov@google.com>
Cr-Commit-Position: refs/heads/master@{#749640}