Initial commit of volley (from frameworks/support)

Change-Id: I62581a4b1ed5c9cb57204ff12cbe7ddff7b490f6
diff --git a/src/com/android/volley/NetworkDispatcher.java b/src/com/android/volley/NetworkDispatcher.java
index 2ef2a19..76e3c65 100644
--- a/src/com/android/volley/NetworkDispatcher.java
+++ b/src/com/android/volley/NetworkDispatcher.java
@@ -16,6 +16,8 @@
 
 package com.android.volley;
 
+import android.os.Process;
+
 import java.util.concurrent.BlockingQueue;
 
 /**
@@ -68,6 +70,7 @@
 
     @Override
     public void run() {
+        Process.setThreadPriority(Process.THREAD_PRIORITY_BACKGROUND);
         Request request;
         while (true) {
             try {