am 160edb36: Add ability to guard a thread against setting its own prio to bg

Merge commit '160edb3645f8b7012bab70ae6e6e8c4a5733082b' into gingerbread-plus-aosp

* commit '160edb3645f8b7012bab70ae6e6e8c4a5733082b':
  Add ability to guard a thread against setting its own prio to bg

core/java/android/os/Process.java

@@ -625,6 +625,15 @@ public class Process {
     public static final native void setThreadPriority(int tid, int priority)
             throws IllegalArgumentException, SecurityException;
 
+    /**
+     * Call with 'false' to cause future calls to {@link #setThreadPriority(int)} to
+     * throw an exception if passed a background-level thread priority.  This is only
+     * effective if the JNI layer is built with GUARD_THREAD_PRIORITY defined to 1.
+     *
+     * @hide
+     */
+    public static final native void setCanSelfBackground(boolean backgroundOk);
+
     /**
      * Sets the scheduling group for a thread.
      * @hide