[tab_grid] Hack-in border for active tab.

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

Index: ios/chrome/browser/ui/tab_switcher/tab_switcher_panel_cell.mm
diff --git a/ios/chrome/browser/ui/tab_switcher/tab_switcher_panel_cell.mm b/ios/chrome/browser/ui/tab_switcher/tab_switcher_panel_cell.mm
index bf3f9f2a0903d91941caa85d9a1f67eaf6ff2277..0ebde50a27c7a3ee8655f79ef3076c111c357c8b 100644
--- a/ios/chrome/browser/ui/tab_switcher/tab_switcher_panel_cell.mm
+++ b/ios/chrome/browser/ui/tab_switcher/tab_switcher_panel_cell.mm
@@ -75,6 +75,19 @@ CGFloat tabSwitcherLocalSessionCellTopBarHeight() {
   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];