Add omnibox location disclosure snackbar.
This snackbar notifies the user that the default search engine uses the
device location to provide local search results.
This snackbar appears the first time a user focuses the omnibox when the
X-Geo header has the potential to be sent along with a search request.
For this to happen, several conditions have to be met:
- The current tab is not incognito
- (Android M+) Chrome has been granted location permission.
- The default search engine is Google
- Location is not disabled for google.com (or google.fr, etc) in
Chrome's site settings.
BUG=505481
Review URL: https://codereview.chromium.org/
1226103004
Cr-Commit-Position: refs/heads/master@{#338631}