[ios] Improve toolbar in tab_grid

ios/clean/chrome/browser/ui/tab_grid/tab_grid_toolbar.h

Index: ios/clean/chrome/browser/ui/tab_grid/tab_grid_toolbar.h
diff --git a/ios/clean/chrome/browser/ui/tab_grid/tab_grid_toolbar.h b/ios/clean/chrome/browser/ui/tab_grid/tab_grid_toolbar.h
new file mode 100644
index 0000000000000000000000000000000000000000..723ad3834866e6745f2393e3bd7357a77fe6f917
--- /dev/null
+++ b/ios/clean/chrome/browser/ui/tab_grid/tab_grid_toolbar.h
@@ -0,0 +1,18 @@
+// Copyright 2017 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_CLEAN_CHROME_BROWSER_UI_TAB_GRID_TAB_GRID_TOOLBAR_H_
+#define IOS_CLEAN_CHROME_BROWSER_UI_TAB_GRID_TAB_GRID_TOOLBAR_H_
+
+#import <UIKit/UIKit.h>
+
+// The toolbar in the tab grid, which has a done button, incognito button, and
+// an overflow menu button. The toolbar has an intrinsic height, and its buttons
+// are anchored to the bottom of the toolbar, should the parent set a larger
+// frame on the toolbar. The toolbar has a dark blur visual effect as the
+// background.
+@interface TabGridToolbar : UIView
+@end
+
+#endif  // IOS_CLEAN_CHROME_BROWSER_UI_TAB_GRID_TAB_GRID_TOOLBAR_H_