Implement timing metrics for UrlRequest

components/cronet/android/api/src/org/chromium/net/RequestFinishedInfo.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.support.annotation.IntDef;
 import android.support.annotation.Nullable;
 
 import java.lang.annotation.Retention;
@@ skipping 222 matching lines @@
 
         /**
          * Returns total bytes sent over the network transport layer, or {@code null} if not
          * collected.
          */
         @Nullable
         public abstract Long getSentBytesCount();
 
         /**
          * Returns total bytes received over the network transport layer, or {@code null} if not
-         * collected.
+         * collected. Number of bytes does not include any previous redirects.
          */
         @Nullable
         public abstract Long getReceivedBytesCount();
     }
 
     private final String mUrl;
     private final Collection<Object> mAnnotations;
     private final Metrics mMetrics;
 
     /** @hide */
@@ skipping 88 matching lines @@
      * If the request failed, returns the same {@link UrlRequestException} provided to
      * {@link UrlRequest.Callback#onFailed}.
      *
      * @return the request's {@link UrlRequestException}, if the request failed
      */
     @Nullable
     public UrlRequestException getException() {
         return mException;
     }
 }