[CCA] Announce different active camera.
In former behavior, the CCA will only announce camera active after click on switch camera facing button. This CL integrate the announce logic into camera reconfiguration cycle and announce once the change of active camera used in preview. Bug: 1020239 Test: Navigate and toggle buttons related to stream reconfiguration by chromevox manually, see if the CCA announce as expected. Change-Id: I95656861f0d34c4bb3cc03e9f9df42952a5e1c54 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1909677 Auto-Submit: Kuo Jen Wei <inker@chromium.org> Reviewed-by:Shik Chen <shik@chromium.org> Commit-Queue: Kuo Jen Wei <inker@chromium.org> Cr-Commit-Position: refs/heads/master@{#714435}
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