[tab_grid] Hack-in border for active tab.

ios/chrome/browser/ui/tab_switcher/tab_switcher_panel_cell.mm

 // Copyright 2015 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/tab_switcher/tab_switcher_panel_cell.h"
 
 #include "base/mac/scoped_nsobject.h"
 #import "ios/chrome/browser/tabs/tab.h"
 #import "ios/chrome/browser/ui/fade_truncated_label.h"
 #import "ios/chrome/browser/ui/image_util.h"
@@ skipping 57 matching lines @@
     [[_containerView layer] setMasksToBounds:YES];
     [[self contentView] addSubview:_containerView];
     [self updateShadow];
     [[[self contentView] layer] setShouldRasterize:YES];
     [[[self contentView] layer]
         setRasterizationScale:[[UIScreen mainScreen] scale]];
   }
   return self;
 }
 
+// PLACEHOLDER: This will be refined to UI mocks.

[marq (ping after 24h), 2017/02/23 11:04:30]

I don't want to put placeholder code into ios/chrome.

I'd suggest subclassing this class in clean/ instead.

[edchin, 2017/02/23 17:41:54]

Good suggestion. Done.

[jif, 2017/02/23 17:43:21]

Or duplicate it in ios/clean?

+// Sets border around selected cell.
+- (void)setSelected:(BOOL)selected {
+  [super setSelected:selected];
+  if (selected) {
+    self.layer.cornerRadius = 2.0f;
+    self.layer.borderWidth = 4.0f;
+    self.layer.borderColor = self.tintColor.CGColor;
+  } else {
+    self.layer.borderWidth = 0.0f;
+  }
+}
+
 - (void)layoutSubviews {
   [super layoutSubviews];
   [self updateShadow];
 }
 
 - (void)updateShadow {
   if (!CGSizeEqualToSize(_cachedShadowSize, self.bounds.size)) {
     CGRect offsetedRectangle = CGRectOffset(self.bounds, 0, 6);
     UIBezierPath* shadowPath =
         [UIBezierPath bezierPathWithRoundedRect:offsetedRectangle
@@ skipping 363 matching lines @@
 - (void)prepareForReuse {
   [_newTabIcon setAlpha:0];
   [_faviconObtainer cancel];
   _faviconObtainer.reset();
   [_raisedButton setAlpha:0];
   [_raisedButton resetState];
   [super prepareForReuse];
 }
 
 @end