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

ios/chrome/browser/ui/tab_grid/tab_grid_tab_cell.mm

+// 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.       =
+// ============================================================================
+
+#import "ios/chrome/browser/ui/tab_grid/tab_grid_tab_cell.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+namespace {
+const CGFloat kCornerRadius = 4.0;
+const CGFloat kSelectedBorderWidth = 2.0;
+}
+
+@implementation TabGridTabCell
+
+@synthesize label = _label;
+
+- (instancetype)initWithFrame:(CGRect)frame {
+  if ((self = [super initWithFrame:frame])) {
+    self.contentView.layer.cornerRadius = kCornerRadius;
+    self.selectedBackgroundView.layer.cornerRadius = kCornerRadius;
+    self.selectedBackgroundView.layer.borderWidth = kSelectedBorderWidth;
+    self.selectedBackgroundView.layer.borderColor = [UIColor blueColor].CGColor;
+    self.selectedBackgroundView.transform = CGAffineTransformScale(
+        self.selectedBackgroundView.transform, 1.05, 1.05);
+
+    _label = [[UILabel alloc] initWithFrame:CGRectZero];
+    _label.translatesAutoresizingMaskIntoConstraints = NO;
+    _label.numberOfLines = 1;
+    _label.textAlignment = NSTextAlignmentCenter;
+    [self.contentView addSubview:_label];
+    [NSLayoutConstraint activateConstraints:@[
+      [_label.centerYAnchor
+          constraintEqualToAnchor:self.contentView.centerYAnchor],
+      [_label.leadingAnchor
+          constraintEqualToAnchor:self.contentView.layoutMarginsGuide
+                                      .leadingAnchor],
+      [_label.trailingAnchor
+          constraintEqualToAnchor:self.contentView.layoutMarginsGuide
+                                      .trailingAnchor],
+    ]];
+  }
+  return self;
+}
+
+@end