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This allows chromium code to use the native perfetto::DataSourceConfig
everywhere rather then having to convert it to a mojo IPC
representation.

We ignore the other config protos in DataSourceConfig because this is
just a mapping inside chromium code so only the chromium proto should be
in use.

In addition we drop the test_config since this typemap is used in
production and we don't need to spend time parsing a test config.

Change-Id: I043a93925a5f31e05a46d7d1b0cc594191d7b726
Reviewed-on: https://chromium-review.googlesource.com/c/1425615Reviewed-by: Yusuke Sato <yusukes@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: oysteine <oysteine@chromium.org>
Reviewed-by: Sami Kyöstilä <skyostil@chromium.org>
Commit-Queue: Stephen Nusko <nuskos@chromium.org>
Auto-Submit: Stephen Nusko <nuskos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#629569}