[ChromeDriver] Add checking element_id format

Bug: chromedriver:2681
Change-Id: Ie9da49cfd5210891210e839ab1f7414580bebbba
Reviewed-on: https://chromium-review.googlesource.com/c/1377615
Reviewed-by: John Chen <johnchen@chromium.org>
Commit-Queue: Tatiana Buldina <buldina@chromium.org>
Cr-Commit-Position: refs/heads/master@{#616706}
3 files changed