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This CL adds a button on the SSO side menu to toggle using WebRTC
protocol in the debug build iOS client. It will make it easier to
debug the WebRTC client or do side-by-side comparison.

This CL also introduces a basic flag setting framework in iOS.

Bug: 748710
Change-Id: I6f7799964b49427330953553f048d67a7d31dce1
Reviewed-on: https://chromium-review.googlesource.com/764987Reviewed-by: Jamie Walch <jamiewalch@chromium.org>
Commit-Queue: Yuwei Huang <yuweih@chromium.org>
Cr-Commit-Position: refs/heads/master@{#515761}