Pass through the parent_tab_id when creating a new tab.

chrome/browser/ui/android/tab_model/tab_model_unittest.cc

Index: chrome/browser/ui/android/tab_model/tab_model_unittest.cc
diff --git a/chrome/browser/ui/android/tab_model/tab_model_unittest.cc b/chrome/browser/ui/android/tab_model/tab_model_unittest.cc
index e4e587a1b8187daca791d7f47e2e75106e2183c8..9a195dbf62b4f48e82a8618cd8b248587df6f7ca 100644
--- a/chrome/browser/ui/android/tab_model/tab_model_unittest.cc
+++ b/chrome/browser/ui/android/tab_model/tab_model_unittest.cc
@@ -34,7 +34,8 @@ class TestTabModel : public TabModel {
   virtual content::WebContents* GetWebContentsAt(int index) const OVERRIDE {
     return NULL;
   }
-  virtual void CreateTab(content::WebContents* web_contents) OVERRIDE {}
+  virtual void CreateTab(content::WebContents* web_contents,
+                         int parent_tab_id) OVERRIDE {}
   virtual content::WebContents* CreateNewTabForDevTools(
       const GURL& url) OVERRIDE {
     return NULL;