Experiment to hide close buttons of inactive tabs when using touch

chrome/browser/ui/views/tabs/tab_unittest.cc

Index: chrome/browser/ui/views/tabs/tab_unittest.cc
diff --git a/chrome/browser/ui/views/tabs/tab_unittest.cc b/chrome/browser/ui/views/tabs/tab_unittest.cc
index 72d999fc57cebce0e710d32e5aa3d28d939e96d4..91a512b6a7fbf9d6589a579becb6bf7ac5d05a3c 100644
--- a/chrome/browser/ui/views/tabs/tab_unittest.cc
+++ b/chrome/browser/ui/views/tabs/tab_unittest.cc
@@ -31,6 +31,9 @@ class FakeTabController : public TabController {
     return selection_model_;
   }
   bool SupportsMultipleSelection() override { return false; }
+  bool ShouldHideCloseButtonForInactiveTab(const Tab* tab) override {
+    return false;
+  }
   void SelectTab(Tab* tab) override {}
   void ExtendSelectionTo(Tab* tab) override {}
   void ToggleSelected(Tab* tab) override {}