[Cronet] Get Cronet performance test running again

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

 // Copyright 2014 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.os.ConditionVariable;
+
+import org.chromium.base.annotations.CalledByNative;
 import org.chromium.base.annotations.JNINamespace;
 
 /**
  * Utilities for Cronet testing
  */
 @JNINamespace("cronet")
 public class CronetTestUtil {
+    private static final ConditionVariable sHostResolverBlock = new ConditionVariable();
+
     /**
-     * Start QUIC server on local host.
-     * @return non-zero QUIC server port number on success or 0 if failed.
+     * Registers customized DNS mapping for {@link NativeTestServer}.

[mef, 2016/01/22 16:21:57]

It is not only for NativeTestServer.

[pauljensen, 2016/01/25 02:47:48]

Done.

+     * @param contextAdapter native context adapter object that this
+     *             mapping should apply to.
+     * @param isLegacyAPI {@code true} if this context adapter is a part of the
+     *             old API.
+     * @param destination host to map to (e.g. 127.0.0.1)
      */
-    public static int startQuicServer() {
-        return nativeStartQuicServer();
+    public static void registerHostResolverProc(

[mef, 2016/01/22 16:21:57]

could it be better to have 2 separate registerHostResolverProc methods, one of
which takes CronetEngine, and another takes legacy object?

[pauljensen, 2016/01/25 02:47:48]

Done.

+            long contextAdapter, boolean isLegacyAPI, String destination) {
+        nativeRegisterHostResolverProc(contextAdapter, isLegacyAPI, destination);
+        sHostResolverBlock.block();
+        sHostResolverBlock.close();
     }
 
-    private static native int nativeStartQuicServer();
+    @CalledByNative
+    private static void onHostResolverProcRegistered() {
+        sHostResolverBlock.open();
+    }
+
+    private static native void nativeRegisterHostResolverProc(
+            long contextAdapter, boolean isLegacyAPI, String destination);
 }