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This change exposes the docked magnifier preferences via extension API.

Bug: 1125420
Test: browser_test ChromeOSInfoPrivateTest
Change-Id: Id38a8a486e8c082e8f5d7973332f1fb8f26673d1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2409072Reviewed-by: Istiaque Ahmed <lazyboy@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Commit-Queue: Hiroki Sato <hirokisato@chromium.org>
Cr-Commit-Position: refs/heads/master@{#815031}