Merge "Form validation: Do not show validation bubble if the page is invisible." to M56 branch

BUG=673163

Review-Url: https://codereview.chromium.org/2572813003
Cr-Commit-Position: refs/heads/master@{#438476}
(cherry picked from commit a8e17a3031b6ad69c399e5e04dd0084e577097fc)

Review-Url: https://codereview.chromium.org/2585473004 .
Cr-Commit-Position: refs/branch-heads/2924@{#523}
Cr-Branched-From: 3a87aecc31cd1ffe751dd72c04e5a96a1fc8108a-refs/heads/master@{#433059}
1 file changed