Use ThreadPrioritySetter to set thread priority

Use ThreadPrioritySetter registered in Android runtime to set thread
priority.

Bug: 139521784
Test: CtsLibcoreTestCases, device boot to home, thread priority set
      as expected.
Change-Id: I46093c9539be3acca9ca580a1e88676bdfd2de54
diff --git a/non_openjdk_java_files.bp b/non_openjdk_java_files.bp
index afc8de8..7b39f09 100644
--- a/non_openjdk_java_files.bp
+++ b/non_openjdk_java_files.bp
@@ -49,6 +49,7 @@
         "dalvik/src/main/java/dalvik/system/RuntimeHooks.java",
         "dalvik/src/main/java/dalvik/system/SocketTagger.java",
         "dalvik/src/main/java/dalvik/system/TemporaryDirectory.java",
+        "dalvik/src/main/java/dalvik/system/ThreadPrioritySetter.java",
         "dalvik/src/main/java/dalvik/system/VMDebug.java",
         "dalvik/src/main/java/dalvik/system/ZygoteHooks.java",
         "dalvik/src/main/java/org/apache/harmony/dalvik/NativeTestTarget.java",