Makes the touch tabstrip scroll so that tabs opened in the background

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

Index: chrome/browser/ui/views/tabs/touch_tab_strip_layout.h
diff --git a/chrome/browser/ui/views/tabs/touch_tab_strip_layout.h b/chrome/browser/ui/views/tabs/touch_tab_strip_layout.h
index bdd955cd8094632b277bf00b5612693fa2748a8e..f0127796964936011f180715f3822511e9f152fc 100644
--- a/chrome/browser/ui/views/tabs/touch_tab_strip_layout.h
+++ b/chrome/browser/ui/views/tabs/touch_tab_strip_layout.h
@@ -96,6 +96,10 @@ class TouchTabStripLayout {
   // Resets to an ideal layout state.
   void ResetToIdealState();
 
+  // Makes |index| visible. This is used when a new tab is added that isn't
+  // active.
+  void MakeVisible(int index);
+
   // Returns the x-coordinate for the active tab constrained by the current tab
   // counts.
   int ConstrainActiveX(int x) const;
@@ -155,8 +159,7 @@ class TouchTabStripLayout {
 
   // Width needed to display |count| tabs.
   int width_for_count(int count) const {
-    return count == 0 ? 0 :
-        (count * size_.width()) + (std::max(count - 1, 0) * padding_);
+    return (count * size_.width()) + (std::max(count - 1, 0) * padding_);
   }
 
   // Padding needed for |count| stacked tabs.