Experiment to hide close buttons of inactive tabs when using touch

chrome/browser/ui/views/tabs/tab_controller.h

Index: chrome/browser/ui/views/tabs/tab_controller.h
diff --git a/chrome/browser/ui/views/tabs/tab_controller.h b/chrome/browser/ui/views/tabs/tab_controller.h
index ea5085b3412094ece64dd2a6d0a78a593ee6647f..327d1147c745a3f6c4eb3b9fa219bdf4a5331a63 100644
--- a/chrome/browser/ui/views/tabs/tab_controller.h
+++ b/chrome/browser/ui/views/tabs/tab_controller.h
@@ -29,6 +29,10 @@ class TabController {
   // Returns true if multiple selection is supported.
   virtual bool SupportsMultipleSelection() = 0;
 
+  // Returns true if the last input type used for this controller was
+  // touch (rather than mouse).
+  virtual bool TouchWasUsedAsLastInput() = 0;

[tdanderson, 2015/02/06 20:34:33]

It seems wrong to add something like this to TabController, but I couldn't think
of a better way to make this information available in Tab.

[sky, 2015/02/07 00:09:39]

Agreed. Maybe this should be ShouldShowCloseButton?

[tdanderson, 2015/02/10 18:52:17]

Done.

+
   // Selects the tab.
   virtual void SelectTab(Tab* tab) = 0;