Bug 747566 - Make tab tray d-pad navigable. r=sriram

mobile/android/base/TabsTray.java

@@ -60,6 +60,8 @@ public class TabsTray extends GeckoActivity implements Tabs.OnTabsChangedListene
         mWaitingForClose = false;
 
         mList = (ListView) findViewById(R.id.list);
+        mList.setItemsCanFocus(true);
+
         mListContainer = (TabsListContainer) findViewById(R.id.list_container);
 
         ImageButton addTab = (ImageButton) findViewById(R.id.add_tab);

mobile/android/base/resources/layout/tabs_row.xml

@@ -1,5 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+                android:focusable="true"
+                android:nextFocusLeft="@+id/close"
                 android:id="@+id/info"
                 android:layout_width="fill_parent"
                 android:layout_height="100dip"
@@ -49,6 +51,7 @@
               android:shadowDy="1"/>
 
     <ImageButton android:id="@+id/close"
+                 android:nextFocusRight="@+id/info"
                  android:layout_width="34dip"
                  android:layout_height="34dip"
                  android:layout_alignParentLeft="true"