Upstream Chrome on iOS source code [1/11].

ios/chrome/app/steps/tab_grid_coordinator+application_step.h

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// ======                        New Architecture                         =====
+// =         This code is only used in the new iOS Chrome architecture.       =
+// ============================================================================
+
+#ifndef IOS_CHROME_APP_STEPS_TAB_GRID_COORDINATOR_APPLICATION_STEP_H_
+#define IOS_CHROME_APP_STEPS_TAB_GRID_COORDINATOR_APPLICATION_STEP_H_
+
+#import <UIKit/UIKit.h>
+
+#include "ios/chrome/app/application_step.h"
+#import "ios/chrome/browser/ui/tab_grid/tab_grid_coordinator.h"
+
+// Category on TabGridCoordinator to allow it to act as an application step
+// and control the root UI for the application when is starts.
+// Creates the main window and makes it key, but doesn't make it visible yet.
+//  Pre:  Application phase is APPLICATION_FOREGROUNDED and the main window is
+//        key.
+//  Post: Application phase is (still) APPLICATION_FOREGROUNDED, the main window
+//        is visible and has a root view controller set.
+@interface TabGridCoordinator (ApplicationStep)<ApplicationStep>
+@end
+
+#endif  // IOS_CHROME_APP_STEPS_TAB_GRID_COORDINATOR_APPLICATION_STEP_H_