Upstream Chrome on iOS source code [9/11].

ios/chrome/browser/ui/ui_types.h

Index: ios/chrome/browser/ui/ui_types.h
diff --git a/ios/chrome/browser/ui/ui_types.h b/ios/chrome/browser/ui/ui_types.h
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index 0000000000000000000000000000000000000000..caeb0c0dff0076e317643372cdd106ac35361764
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+++ b/ios/chrome/browser/ui/ui_types.h
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+// 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_BROWSER_UI_UI_TYPES_H_
+#define IOS_CHROME_BROWSER_UI_UI_TYPES_H_
+
+// Utility typedefs shared across UI components.
+typedef NSArray<NSLayoutConstraint*> Constraints;
+
+#endif  // IOS_CHROME_BROWSER_UI_UI_TYPES_H_