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

ui/ios/NSString+CrStringDrawing.mm

Index: ui/ios/NSString+CrStringDrawing.mm
diff --git a/ui/ios/NSString+CrStringDrawing.mm b/ui/ios/NSString+CrStringDrawing.mm
new file mode 100644
index 0000000000000000000000000000000000000000..2ef03e0bd3b0cc65e9affc02d26f62dde2c66cbd
--- /dev/null
+++ b/ui/ios/NSString+CrStringDrawing.mm
@@ -0,0 +1,18 @@
+// 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.
+
+#import "ui/ios/NSString+CrStringDrawing.h"
+
+@implementation NSString (CrStringDrawing)
+
+- (CGSize)cr_sizeWithFont:(UIFont*)font {
+  if (!font)
+    return CGSizeZero;
+  NSDictionary* attributes = @{ NSFontAttributeName : font };
+  CGSize sizeWithAttributes = [self sizeWithAttributes:attributes];
+  return CGSizeMake(ceil(sizeWithAttributes.width),
+                    ceil(sizeWithAttributes.height));

[stuartmorgan, 2014/08/25 20:17:37]

Do we actually want the ceil? That's just to exactly match the behavior of the
old API it seems like, which is different from just providing a similar
structure of API.

[lliabraa, 2014/08/28 12:13:20]

I've split this into two methods. One is a drop-in replacement for sizeWithFont
(nil-checking, rounding); the other is a convenience wrapper to avoid the
boilerplate of the attributes dictionary (DCHECK on nill font and no rounding).

+}
+
+@end