Upstream ios/showcase source code.

ios/showcase/tab_grid/sc_tab_grid_coordinator.h

Index: ios/showcase/tab_grid/sc_tab_grid_coordinator.h
diff --git a/ios/showcase/tab_grid/sc_tab_grid_coordinator.h b/ios/showcase/tab_grid/sc_tab_grid_coordinator.h
new file mode 100644
index 0000000000000000000000000000000000000000..0ae978074160142043996c9276795c6a56c48abf
--- /dev/null
+++ b/ios/showcase/tab_grid/sc_tab_grid_coordinator.h
@@ -0,0 +1,17 @@
+// 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.
+
+#ifndef IOS_SHOWCASE_TAB_GRID_SC_TAB_GRID_COORDINATOR_H_
+#define IOS_SHOWCASE_TAB_GRID_SC_TAB_GRID_COORDINATOR_H_
+
+#import <UIKit/UIKit.h>
+
+#import "ios/showcase/common/coordinator.h"
+
+@interface SCTabGridCoordinator : NSObject<Coordinator>
+// Redefined to be a UINavigationController.
+@property(nonatomic, weak) UINavigationController* baseViewController;
+@end
+
+#endif  // IOS_SHOWCASE_TAB_GRID_SC_TAB_GRID_COORDINATOR_H_