Adding a WindowAndroidHelper class.

chrome/browser/android/tab_base_android_impl.h

Index: chrome/browser/android/tab_base_android_impl.h
diff --git a/chrome/browser/android/tab_base_android_impl.h b/chrome/browser/android/tab_base_android_impl.h
index 7964a8c4982e5afbd3981a659a737ac301246c75..b05dfac3c680e828f656a56caa3c3fe613f3e311 100644
--- a/chrome/browser/android/tab_base_android_impl.h
+++ b/chrome/browser/android/tab_base_android_impl.h
@@ -25,6 +25,10 @@ namespace content {
 class WebContents;
 }
 
+namespace ui {
+class WindowAndroid;
+}
+
 namespace WebKit {
 class WebLayer;
 }
@@ -33,7 +37,8 @@ class TabBaseAndroidImpl : public TabAndroid {
  public:
   TabBaseAndroidImpl(JNIEnv* env,
                      jobject obj,
-                     content::WebContents* web_contents);
+                     content::WebContents* web_contents,
+                     ui::WindowAndroid* window_android);
   void Destroy(JNIEnv* env, jobject obj);
 
   WebKit::WebLayer* tab_layer() const { return tab_layer_.get(); }