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The stylus Assistant mode feature is restricted to Google devices. Add a
util method to check the board type while adding the metalayer tool.

Bug: 996312
Test: Run existing tests
Change-Id: Iaa75fe8901d6be382c2525dfa64bb193f84ccaeb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1779187
Commit-Queue: Yue Li <updowndota@chromium.org>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#692228}