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This change:
- adds the ability to swap between Autoclick and Magnifier in the same accessibility_common extension
- fixes the accessibility_common_manifest_guest.json path; accessibility_common was actually not being loaded when using guest manifests (e.g. login screen)
- adds starter class for magnifier

R=katie@chromium.org

AX-Relnotes: n/a
Test: toggle all states of autoclick and magnifier: 0, 0; 0, 1; 1,0; 1,1. Verify the correct accessibilityCommon.autoclick_ and accessibilityCommon.magnifier_ objects get nullified/set and that the extension gets unloaded with 0,0. Automated tests tbd.
Change-Id: I5bf2c25dd1a65403c07c5941c48129cd8ad86a1b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2325131
Commit-Queue: David Tseng <dtseng@chromium.org>
Reviewed-by: Katie Dektar <katie@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#792857}