Experiment to hide close buttons of inactive tabs when using touch

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

 // Copyright (c) 2012 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.
 
 #ifndef CHROME_BROWSER_UI_VIEWS_TABS_TAB_CONTROLLER_H_
 #define CHROME_BROWSER_UI_VIEWS_TABS_TAB_CONTROLLER_H_
 
 #include "chrome/browser/ui/views/tabs/tab_strip_types.h"
 
 class Tab;
@@ skipping 11 matching lines @@
 }
 
 // Controller for tabs.
 class TabController {
  public:
   virtual const ui::ListSelectionModel& GetSelectionModel() = 0;
 
   // 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;
 
   // Extends the selection from the anchor to |tab|.
   virtual void ExtendSelectionTo(Tab* tab) = 0;
 
   // Toggles whether |tab| is selected.
   virtual void ToggleSelected(Tab* tab) = 0;
 
   // Adds the selection from the anchor to |tab|.
@@ skipping 52 matching lines @@
 
   // Adds private information to the tab's accessibility state.
   virtual void UpdateTabAccessibilityState(const Tab* tab,
                                         ui::AXViewState* state) = 0;
 
  protected:
   virtual ~TabController() {}
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_TABS_TAB_CONTROLLER_H_