Add NSString category for providing iOS6-style string drawing APIs.

ui/ios/NSString+CrStringDrawing.h

+// Copyright 2014 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 UI_IOS_NSSTRING_CR_STRING_DRAWING_H_
+#define UI_IOS_NSSTRING_CR_STRING_DRAWING_H_
+
+#import <UIKit/UIKit.h>
+
+@interface NSString (CrStringDrawing)
+
+// Returns the size of the string if it were to be rendered with the specified
+// font on a single line.
+//
+// This method is a convenience wrapper around sizeWithAttributes: to avoid
+// boilerplate required to put |font| in a dictionary of attributes. Do not pass
+// nil into this method.
+- (CGSize)cr_sizeWithFont:(UIFont*)font;
+
+// Returns the integral size of the string (i.e. width and height rounded up to
+// integer values) if it were to be rendered with the specified font on a single
+// line.
+//
+// This method provides a drop-in replacement for sizeWithFont:, which was
+// deprecated in iOS 7 in favor of -sizeWithAttributes:. Specifically, this
+// method will return CGSizeZero if |font| is nil, and the width and height
+// returned are rounded up to integer values.

[stuartmorgan, 2014/08/28 15:18:14]

Please add a note that this is deprecated and no new uses should be added, and
put a TODO (you can put me if you like) to remove it. My guess is that, e.g.,
GetStringWidthF doesn't actually need rounded values, and that we shouldn't
actually be using this there. Any specific call sites that want nil handling, or
rounding, should be doing it locally.

[lliabraa, 2014/08/28 19:25:05]

Done.

+- (CGSize)cr_integralSizeWithFont:(UIFont*)font;
+
+@end
+
+#endif  // UI_IOS_NSSTRING_CR_STRING_DRAWING_H_