GitLab

Adds logic to notify the home screen delegate of transition to home
screen from app (when home button is tapped) for homerview transition.
This reflects what's done by HomeLauncherGestureHandler when
kHomerviewGesture feature is not enabled. Some perf tests rely on this
notification being sent (for example LauncherDragTest.Close/1).

BUG=1005366

Change-Id: I0a12ddb1289c8e5d1d093f438bdaa9a354deba29
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1897011Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Toni Baržić <tbarzic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712650}