Allow close dialog to be shown when tabs icon is pressed

app/src/main/java/acr/browser/lightning/activity/BrowserActivity.java

@@ -828,7 +828,8 @@ public abstract class BrowserActivity extends ThemableBrowserActivity implements
         quit.setOnClickListener(this);
     }
 
-    private void showCloseDialog(final int position) {
+    @Override
+    public void showCloseDialog(final int position) {
         if (position < 0) {
             return;
         }

app/src/main/java/acr/browser/lightning/controller/UIController.java

@@ -51,4 +51,6 @@ public interface UIController {
 
     void closeEmptyTab();
 
+    void showCloseDialog(int position);
+
 }

app/src/main/java/acr/browser/lightning/fragment/TabsFragment.java

@@ -167,6 +167,9 @@ public class TabsFragment extends Fragment implements View.OnClickListener, View
     @Override
     public void onClick(@NonNull View v) {
         switch (v.getId()) {
+            case R.id.tab_header_button:
+                mUiController.showCloseDialog(tabsManager.indexOfCurrentTab());
+                break;
             case R.id.new_tab_button:
                 mBus.post(new TabEvents.NewTab());
                 break;