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"b=" -- the build number
"p=" -- the patch number
"c=" -- the client type (current values are "ios", "android", and "webview")

Currently, b and p only make sense for chrome types and are only being implemented for ios and android.

BUG=409934

Review URL: https://codereview.chromium.org/530153002

Cr-Commit-Position: refs/heads/master@{#293591}