Force URLs in omnibox suggestions to layout LTR.

ios/chrome/browser/ui/omnibox/truncating_attributed_label.mm

 // Copyright (c) 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.
 
 #import "ios/chrome/browser/ui/omnibox/truncating_attributed_label.h"
 
 #include <algorithm>
 
 #include "base/mac/scoped_cftyperef.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
 #endif
 
 @interface OmniboxPopupTruncatingLabel ()
 - (void)setup;
 - (UIImage*)getLinearGradient:(CGRect)rect;
 @end
 
 @implementation OmniboxPopupTruncatingLabel {
   // Gradient used to create fade effect. Changes based on view.frame size.
   UIImage* gradient_;
 }
 
 @synthesize truncateMode = truncateMode_;
+@synthesize displayAsURL = displayAsURL_;
 
 - (void)setup {
   self.backgroundColor = [UIColor clearColor];
   truncateMode_ = OmniboxPopupTruncatingTail;
 }
 
 - (id)initWithFrame:(CGRect)frame {
   self = [super initWithFrame:frame];
   if (self) {
     self.lineBreakMode = NSLineBreakByClipping;
@@ skipping 27 matching lines @@
     CGContextClipToMask(context, self.bounds, [gradient_ CGImage]);
 
   // Add the specified line break and alignment attributes to attributedText and
   // draw the result.
   NSMutableAttributedString* attributedString =
       [self.attributedText mutableCopy];
   NSMutableParagraphStyle* textStyle =
       [[NSParagraphStyle defaultParagraphStyle] mutableCopy];
   textStyle.lineBreakMode = self.lineBreakMode;
   textStyle.alignment = self.textAlignment;
+  // URLs have their text direction set to to LTR (avoids RTL characters
+  // making the URL render from right to left, as per RFC 3987 Section 4.1).
+  if (self.displayAsURL)
+    textStyle.baseWritingDirection = NSWritingDirectionLeftToRight;
   [attributedString addAttribute:NSParagraphStyleAttributeName
                            value:textStyle
                            range:NSMakeRange(0, [self.text length])];
   [attributedString drawInRect:requestedRect];
 
   CGContextRestoreGState(context);
 }
 
 - (void)setTextAlignment:(NSTextAlignment)textAlignment {
   if (textAlignment == NSTextAlignmentLeft) {
@@ skipping 52 matching lines @@
 
   // Clean up, return image.
   CGImageRef ref = CGBitmapContextCreateImage(context);
   UIImage* image = [UIImage imageWithCGImage:ref];
   CGImageRelease(ref);
   CGContextRelease(context);
   return image;
 }
 
 @end