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Add more data type check for backend response.

Bug: b:169854546
Test: run locally and start ambient mode with celsius settings
Change-Id: If2cd60b363943fe6f3728a9e614a8a1f35431b7f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2444178Reviewed-by: Jeroen Dhollander <jeroendh@chromium.org>
Reviewed-by: Tao Wu <wutao@chromium.org>
Commit-Queue: Xiaohui Chen <xiaohuic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813303}