Merge "Refine documentation for Process.setThreadPriority"

am: fd1985993c

Change-Id: Id4ed16101733751e23a6eefed29a8acf306c9672

core/java/android/os/Process.java

@@ -740,11 +740,12 @@ public class Process {
 
     /**
      * Set the priority of a thread, based on Linux priorities.
-     * 
-     * @param tid The identifier of the thread/process to change.
+     *
+     * @param tid The identifier of the thread/process to change. It should be
+     * the native thread id but not the managed id of {@link java.lang.Thread}.
      * @param priority A Linux priority level, from -20 for highest scheduling
      * priority to 19 for lowest scheduling priority.
-     * 
+     *
      * @throws IllegalArgumentException Throws IllegalArgumentException if
      * <var>tid</var> does not exist.
      * @throws SecurityException Throws SecurityException if your process does