Bug 1045819 - Specify gravity on fragments for margin to take effect on gingerbread. r=eedens

mobile/android/search/res/layout/search_activity_main.xml

@@ -15,18 +15,21 @@
         android:name="org.mozilla.search.PostSearchFragment"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
-        android:layout_marginTop="@dimen/search_bar_height"/>
+        android:layout_marginTop="@dimen/search_bar_height"
+        android:layout_gravity="top"/>
 
     <fragment
         android:id="@+id/presearch"
         android:name="org.mozilla.search.PreSearchFragment"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
-        android:layout_marginTop="@dimen/search_bar_height"/>
+        android:layout_marginTop="@dimen/search_bar_height"
+        android:layout_gravity="top"/>
 
     <fragment
         android:id="@+id/search_fragment"
         android:name="org.mozilla.search.autocomplete.SearchFragment"
         android:layout_width="match_parent"
-        android:layout_height="match_parent"/>
+        android:layout_height="match_parent"
+        android:layout_gravity="top"/>
 </merge>