Don't activate keyguard if screen is turned off while proximity sensor is active.

Signed-off-by: Mike Lockwood <lockwood@android.com>
diff --git a/core/java/android/view/WindowManagerPolicy.java b/core/java/android/view/WindowManagerPolicy.java
index ea08f33..dd4b65f 100644
--- a/core/java/android/view/WindowManagerPolicy.java
+++ b/core/java/android/view/WindowManagerPolicy.java
@@ -355,6 +355,8 @@
     public final int OFF_BECAUSE_OF_USER = 1;
     /** Screen turned off because of timeout */
     public final int OFF_BECAUSE_OF_TIMEOUT = 2;
+    /** Screen turned off because of proximity sensor */
+    public final int OFF_BECAUSE_OF_PROXIMITY_SENSOR = 3;
 
     /**
      * Magic constant to {@link IWindowManager#setRotation} to not actually