Bug 1312434 - add ContentDescription to Activity Stream menus and topsites r=sebastian

MozReview-Commit-ID: AvkG5OVSBsj

--HG--
extra : rebase_source : 97174e1df3ef5b553b0d52284a786ed672f43690

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

@@ -38,6 +38,7 @@
             android:layout_alignParentTop="true"
             android:layout_gravity="right|top"
             android:padding="2dp"
+            android:contentDescription="@string/menu"
             android:layout_marginLeft="@dimen/activity_stream_base_margin"
             android:layout_marginBottom="@dimen/activity_stream_base_margin"
             android:src="@drawable/menu" />

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

@@ -11,6 +11,7 @@
         android:layout_width="match_parent"
         android:layout_height="match_parent"
         android:id="@+id/topsites_pager"
+        android:contentDescription="@string/activity_stream_topsites"
         android:layout_alignParentTop="true"
         android:layout_alignParentLeft="true"
         android:layout_alignParentStart="true"/>

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

@@ -53,6 +53,7 @@
             android:layout_alignParentTop="true"
             android:layout_gravity="right|top"
             android:padding="6dp"
+            android:contentDescription="@string/menu"
             android:src="@drawable/menu" />
 
     </RelativeLayout>