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This adds an skeleton for the credential provider service, which will be
in charge of listening to the changes in the password store and keep
Credential Provider data in sync.

Bug: 1066803
Change-Id: Iedec647ff9a18f5aae013bd318d095019af65be1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2133928
Commit-Queue: Javier Ernesto Flores Robles <javierrobles@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756286}