Implement timing metrics for UrlRequest

components/cronet/android/java/src/org/chromium/net/impl/CronetMetrics.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.impl;
 
 import android.support.annotation.Nullable;
 
 import org.chromium.base.VisibleForTesting;
 import org.chromium.net.RequestFinishedInfo;
@@ skipping 104 matching lines @@
         mSendingStartMs = sendingStartMs;
         mSendingEndMs = sendingEndMs;
         mPushStartMs = pushStartMs;
         mPushEndMs = pushEndMs;
         mResponseStartMs = responseStartMs;
         mResponseEndMs = responseEndMs;
         mSocketReused = socketReused;
         mSentBytesCount = sentBytesCount;
         mReceivedBytesCount = receivedBytesCount;
 
-        // Don't care about these anymore
-        mTtfbMs = null;
-        mTotalTimeMs = null;
+        // TODO(mgersh): delete these after embedders stop using them http://crbug.com/629194
+        if (requestStartMs != -1 && responseStartMs != -1) {
+            mTtfbMs = responseStartMs - requestStartMs;
+        } else {
+            mTtfbMs = null;
+        }
+        if (requestStartMs != -1 && responseEndMs != -1) {
+            mTotalTimeMs = responseEndMs - requestStartMs;
+        } else {
+            mTotalTimeMs = null;
+        }
     }
 
     @Nullable
     public Date getRequestStart() {
         return toDate(mRequestStartMs);
     }
 
     @Nullable
     public Date getDnsStart() {
         return toDate(mDnsStartMs);
@@ skipping 72 matching lines @@
     @Nullable
     public Long getSentBytesCount() {
         return mSentBytesCount;
     }
 
     @Nullable
     public Long getReceivedBytesCount() {
         return mReceivedBytesCount;
     }
 }