Introduce @CalledByReflection annotation.

components/cronet/android/java/src/org/chromium/net/ChromiumUrlRequestFactory.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.content.Context;
 import android.os.Build;
 
+import org.chromium.base.UsedByReflection;
+
 import java.nio.channels.WritableByteChannel;
 import java.util.Map;
 
 /**
  * Network request factory using the native http stack implementation.
  */
 @UsedByReflection("HttpUrlRequestFactory.java")
 public class ChromiumUrlRequestFactory extends HttpUrlRequestFactory {
     private ChromiumUrlRequestContext mRequestContext;
 
@@ skipping 30 matching lines @@
             Map<String, String> headers, WritableByteChannel channel,
             HttpUrlRequestListener listener) {
         return new ChromiumUrlRequest(mRequestContext, url, requestPriority,
                 headers, channel, listener);
     }
 
     public ChromiumUrlRequestContext getRequestContext() {
         return mRequestContext;
     }
 }