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This CL makes sure the fake device stream gets updated when pan and tilt
options change so that web developers get to see effects in real-time.

Bug: 934063
Change-Id: Idaddacdbc22f1eb77a3b4e2fb9546c33e37f2fcb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2276424Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Commit-Queue: François Beaufort <beaufort.francois@gmail.com>
Cr-Commit-Position: refs/heads/master@{#784474}