[Cronet] Added a unit test in QuicTest to test async API.

components/cronet/android/test/src/org/chromium/net/QuicTestServer.java

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.net;
 
 import android.content.Context;
 import android.os.ConditionVariable;
 
 import org.chromium.base.CalledByNative;
 import org.chromium.base.JNINamespace;
+import org.chromium.base.Log;
 
 /**
  * Wrapper class to start a Quic test server.
  */
 @JNINamespace("cronet")
 public final class QuicTestServer {
     private static final ConditionVariable sBlock = new ConditionVariable();
+    private static final String TAG = Log.makeTag("QuicTestServer");
 
     public static void startQuicTestServer(Context context) {
+        TestFilesInstaller.installIfNeeded(context);
         nativeStartQuicTestServer(TestFilesInstaller.getInstalledPath(context));
         sBlock.block();
     }
 
     public static void shutdownQuicTestServer() {
         nativeShutdownQuicTestServer();
         sBlock.close();
     }
 
     public static String getServerURL() {
         return "http://" + getServerHost() + ":" + getServerPort();
     }
 
     public static String getServerHost() {
         return nativeGetServerHost();
     }
 
     public static int getServerPort() {
         return nativeGetServerPort();
     }
 
     @CalledByNative
     private static void onServerStarted() {
+        Log.i(TAG, "Quic server started.");
         sBlock.open();
     }
 
     private static native void nativeStartQuicTestServer(String filePath);
     private static native void nativeShutdownQuicTestServer();
     private static native String nativeGetServerHost();
     private static native int nativeGetServerPort();
 }