linux-aura: Restore middle-click on new-tab button behaviour.

chrome/browser/ui/tabs/tab_strip_model_delegate.h

Index: chrome/browser/ui/tabs/tab_strip_model_delegate.h
diff --git a/chrome/browser/ui/tabs/tab_strip_model_delegate.h b/chrome/browser/ui/tabs/tab_strip_model_delegate.h
index cc2f7d2b47fbffd752a0fd5ce718e885dce4d8fd..2e27f114d8c782ff8c362b56eb0f3be494a56d8b 100644
--- a/chrome/browser/ui/tabs/tab_strip_model_delegate.h
+++ b/chrome/browser/ui/tabs/tab_strip_model_delegate.h
@@ -11,6 +11,7 @@
 
 class Browser;
 class DockInfo;
+class GURL;
 
 namespace content {
 class WebContents;
@@ -51,6 +52,10 @@ class TabStripModelDelegate {
   // value of -1 means to append the contents to the end of the tab strip.
   virtual void AddBlankTabAt(int index, bool foreground) = 0;
 
+  // Adds a tab to the model and loads |url| in the tab. An |index| value of -1
+  // means to append the contents to the end of the tab strip.
+  virtual void AddURLTabAt(const GURL& url, int index, bool foreground) = 0;
+
   // Asks for a new TabStripModel to be created and the given web contentses to
   // be added to it. Its size and position are reflected in |window_bounds|.
   // If |dock_info|'s type is other than NONE, the newly created window should