[Home] Record some user actions for the Chrome Home BottomSheet

Record user actions for:
 * Android.ChromeHome.Closed
 * Android.ChromeHome.FullState
 * Android.ChromeHome.HalfState
 * Android.ChromeHome.Opened
 * Android.ChromeHome.ShowBookmarks
 * Android.ChromeHome.ShowDownloads
 * Android.ChromeHome.ShowHistory
 * Android.ChromeHome.ShowSuggestions

BUG=700589

Review-Url: https://codereview.chromium.org/2754313002
Cr-Commit-Position: refs/heads/master@{#458229}
13 files changed