Hides the autoclick bubble when the cursor hides in fullscreen mode.

This will let the autoclick bubble hide when a user is doing a full-screen
activity without the cursor, such as watching a YouTube video.

Test:Tried with YouTube full-screen on Chrome OS emulated on Linux, and
added autoclick and cursor manager tests.

Bug: 962651
Change-Id: Ie674e8f7d65c1217aea171f1900af18b07ed481d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1610655
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Commit-Queue: Katie Dektar <katie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#661837}
7 files changed