Adds @UsedByReflection to the CronetUrlRequestContext constructor

components/cronet/android/java/src/org/chromium/net/CronetUrlRequestContext.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 android.os.ConditionVariable;
 import android.os.Handler;
 import android.os.Looper;
 import android.os.Process;
 import android.util.Log;
 
 import org.chromium.base.CalledByNative;
 import org.chromium.base.JNINamespace;
 import org.chromium.base.NativeClassQualifiedName;
+import org.chromium.base.UsedByReflection;
 
 import java.util.concurrent.Executor;
 import java.util.concurrent.atomic.AtomicInteger;
 
 /**
  * UrlRequest context using Chromium HTTP stack implementation.
  */
 @JNINamespace("cronet")
+@UsedByReflection("UrlRequestContext.java")
 public class CronetUrlRequestContext extends UrlRequestContext  {
     private static final int LOG_NONE = 3;  // LOG(FATAL), no VLOG.
     private static final int LOG_DEBUG = -1;  // LOG(FATAL...INFO), VLOG(1)
     private static final int LOG_VERBOSE = -2;  // LOG(FATAL...INFO), VLOG(2)
     static final String LOG_TAG = "ChromiumNetwork";
 
     /**
      * Synchronize access to mUrlRequestContextAdapter and shutdown routine.
      */
     private final Object mLock = new Object();
     private final ConditionVariable mInitCompleted = new ConditionVariable(false);
     private final AtomicInteger mActiveRequestCount = new AtomicInteger(0);
 
     private long mUrlRequestContextAdapter = 0;
     private Thread mNetworkThread;
 
+    @UsedByReflection("UrlRequestContext.java")
     public CronetUrlRequestContext(Context context,
                                    UrlRequestContextConfig config) {
         CronetLibraryLoader.ensureInitialized(context, config);
         nativeSetMinLogLevel(getLoggingLevel());
         mUrlRequestContextAdapter = nativeCreateRequestContextAdapter(config.toString());
         if (mUrlRequestContextAdapter == 0) {
             throw new NullPointerException("Context Adapter creation failed.");
         }
 
         // Init native Chromium URLRequestContext on main UI thread.
@@ skipping 152 matching lines @@
     @NativeClassQualifiedName("CronetURLRequestContextAdapter")
     private native void nativeStartNetLogToFile(long nativePtr,
             String fileName);
 
     @NativeClassQualifiedName("CronetURLRequestContextAdapter")
     private native void nativeStopNetLog(long nativePtr);
 
     @NativeClassQualifiedName("CronetURLRequestContextAdapter")
     private native void nativeInitRequestContextOnMainThread(long nativePtr);
 }