[UI Refresh] Exit fullscreen when tapping the fullscreen steady locbar.

When the steady location bar is tapped when in scrolled-away state, it
now exits fullscreen first; only the second tap focuses the omnibox.

Bug: 821807
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: Iadaed09fa545d4335872f4f5990d6201a2351782
Reviewed-on: https://chromium-review.googlesource.com/1113749Reviewed-by: Kurt Horimoto <kkhorimoto@chromium.org>
Commit-Queue: Stepan Khapugin <stkhapugin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#570353}

ios/chrome/browser/ui/location_bar/location_bar_coordinator.mm

@@ -265,7 +265,16 @@ const int kLocationAuthorizationStatusCount = 4;
 #pragma mark - LocationBarViewControllerDelegate
 
 - (void)locationBarSteadyViewTapped {
-  [self focusOmnibox];
+  FullscreenController* fullscreenController =
+      FullscreenControllerFactory::GetInstance()->GetForBrowserState(
+          _browserState);
+  if (fullscreenController->GetProgress() < 1) {
+    // The first tap should exit fullscreen.
+    fullscreenController->ResetModel();
+  } else {
+    // The toolbar is fully visible, focus the omnibox.
+    [self focusOmnibox];
+  }
 }
 
 #pragma mark - LocationBarConsumer