[Cronet] Move setExperimentalOptions() to ExperimentalCronetEngine.Builder

components/cronet/android/api/src/org/chromium/net/ExperimentalCronetEngine.java

 // Copyright 2016 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.support.annotation.VisibleForTesting;
 
 import java.io.IOException;
 import java.net.Proxy;
@@ skipping 152 matching lines @@
          * <a href="https://developer.chrome.com/multidevice/data-compression">Data
          * Reduction Proxy</a>. Defaults to disabled.
          * @param key key to use when authenticating with the proxy.
          * @return the builder to facilitate chaining.
          */
         public Builder enableDataReductionProxy(String key) {
             mBuilderDelegate.enableDataReductionProxy(key);
             return this;
         }
 
+        /**
+         * Sets experimental options to be used in Cronet.
+         *
+         * @param options JSON formatted experimental options.
+         * @return the builder to facilitate chaining.
+         */
+        public Builder setExperimentalOptions(String options) {
+            mBuilderDelegate.setExperimentalOptions(options);
+            return this;
+        }
+
         @VisibleForTesting
         ICronetEngineBuilder getBuilderDelegate() {
             return mBuilderDelegate;
         }
 
         // To support method chaining, override superclass methods to return an
         // instance of this class instead of the parent.
 
         @Override
         public Builder setUserAgent(String userAgent) {
@@ skipping 50 matching lines @@
             return this;
         }
 
         @Override
         public Builder enablePublicKeyPinningBypassForLocalTrustAnchors(boolean value) {
             super.enablePublicKeyPinningBypassForLocalTrustAnchors(value);
             return this;
         }
 
         @Override
-        public Builder setExperimentalOptions(String options) {
-            super.setExperimentalOptions(options);
-            return this;
-        }
-
-        @Override
         public ExperimentalCronetEngine build() {
             return mBuilderDelegate.build();
         }
     }
 
     /**
      * Creates a builder for {@link BidirectionalStream} objects. All callbacks for
      * generated {@code BidirectionalStream} objects will be invoked on
      * {@code executor}. {@code executor} must not run tasks on the
      * current thread, otherwise the networking operations may block and exceptions
@@ skipping 174 matching lines @@
      * {@link #CONNECTION_METRIC_UNKNOWN} if the value is
      * unavailable. This must be called after
      * {@link Builder#enableNetworkQualityEstimator}, and will
      * throw an exception otherwise.
      * @return Estimate of the downstream throughput in kilobits per second.
      */
     public int getDownstreamThroughputKbps() {
         return CONNECTION_METRIC_UNKNOWN;
     }
 }