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Part 6.

This change adds two syncable preferences related to using cloud services with Media Router.

kMediaRouterCloudServicesPrefSet tracks whether or not the user has explicitly acknowledged the first run flow with the cloud services preference present. This is important to keep track of since there are users who have acknowledged the first run flow before the work related to the cloud services lands (currently in progress). This will be used to surface a different prompt to ask if users want to enable cloud services.

kMediaRouterEnableCloudServices tracks whether the user has enabled cloud services.

BUG=560457

Review URL: https://codereview.chromium.org/1582943003

Cr-Commit-Position: refs/heads/master@{#371456}