am da926cf2: Merge "TalkBack does not announce properly the buttons of the PIN lock." into ics-mr1

* commit 'da926cf284ff5f5ccf91dec088ff64d442cee25c':
  TalkBack does not announce properly the buttons of the PIN lock.

core/res/res/layout-sw600dp/keyguard_screen_password_landscape.xml

@@ -134,6 +134,7 @@
                 android:layout_marginTop="5dip"
                 android:keyBackground="@drawable/btn_keyboard_key_ics"
                 android:visibility="gone"
+                android:clickable="true"
             />
 
             <!-- Emergency call button. Generally not used on tablet devices. -->

core/res/res/layout-sw600dp/keyguard_screen_password_portrait.xml

@@ -133,6 +133,7 @@
             android:background="#40000000"
             android:keyBackground="@drawable/btn_keyboard_key_ics"
             android:layout_marginBottom="80dip"
+            android:clickable="true"
         />
 
         <!-- emergency call button -->

core/res/res/layout/keyguard_screen_password_landscape.xml

@@ -193,6 +193,7 @@
         android:keyBackground="@*android:drawable/btn_keyboard_key_ics"
         android:visibility="gone"
         android:layout_rowSpan="7"
+        android:clickable="true"
     />
 
     <!-- Music transport control -->

core/res/res/layout/keyguard_screen_password_portrait.xml

@@ -157,6 +157,7 @@
         android:background="#40000000"
         android:keyBackground="@*android:drawable/btn_keyboard_key_ics"
         android:visibility="gone"
+        android:clickable="true"
     />
 
     <TextView