Add convenience methods for checking horizontal size class.

ios/chrome/browser/ui/uikit_ui_util.h

 // Copyright 2012 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_CHROME_BROWSER_UI_UIKIT_UI_UTIL_H_
 #define IOS_CHROME_BROWSER_UI_UIKIT_UI_UTIL_H_
 
 #include <CoreGraphics/CoreGraphics.h>
 #import <Foundation/Foundation.h>
 #import <UIKit/UIKit.h>
@@ skipping 158 matching lines @@
 // |subview| must be a subview of |parentView|.
 void AddSameCenterYConstraint(UIView* parentView, UIView* subview);
 
 // Adds a constraint that |subview1| and |subview2| are center aligned
 // vertically on |parentView|.
 // |subview1| and |subview2| must be subview of |parentView|.
 void AddSameCenterYConstraint(UIView* parentView,
                               UIView* subview1,
                               UIView* subview2);
 
+// Whether the |environment| has a compact horizontal size class.
+bool IsCompact(id<UITraitEnvironment> environment);
+
 // Whether the main application window's rootViewController has a compact
 // horizontal size class.
 bool IsCompact();
 
+// Whether the |environment| has a compact iPad horizontal size class.
+bool IsCompactTablet(id<UITraitEnvironment> environment);
+
 // Whether the main application window's rootViewController has a compact
 // iPad horizontal size class.
 bool IsCompactTablet();
 
 #endif  // IOS_CHROME_BROWSER_UI_UIKIT_UI_UTIL_H_