Cherry pick histogram(OAuth2TokenServiceDelegateAndroid.SeedState) from r1456283005 to ToT.
Cherry pick histogram(OAuth2TokenServiceDelegateAndroid.SeedState) from r1456283005 to ToT.

The histogram is only valid on M47 on Android but UMA only looks at ToT.

BUG=535211

Review URL: https://codereview.chromium.org/1464773003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#360876}

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