Move Cronet metrics-related classes into their own files

components/cronet/android/api/src/org/chromium/net/UrlRequestMetrics.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.Nullable;
+
+/**
+ * Metrics collected for a single request.
+ *
+ * {@hide} as it's a prototype.
+ */
+public final class UrlRequestMetrics {
+    @Nullable
+    private final Long mTtfbMs;
+    @Nullable
+    private final Long mTotalTimeMs;
+    @Nullable
+    private final Long mSentBytesCount;
+    @Nullable
+    private final Long mReceivedBytesCount;
+
+    public UrlRequestMetrics(@Nullable Long ttfbMs, @Nullable Long totalTimeMs,
+            @Nullable Long sentBytesCount, @Nullable Long receivedBytesCount) {
+        mTtfbMs = ttfbMs;
+        mTotalTimeMs = totalTimeMs;
+        mSentBytesCount = sentBytesCount;
+        mReceivedBytesCount = receivedBytesCount;
+    }
+
+    /**
+     * Returns milliseconds between request initiation and first byte of response headers,
+     * or null if not collected.
+     */
+    @Nullable
+    public Long getTtfbMs() {
+        return mTtfbMs;
+    }
+
+    /**
+     * Returns milliseconds between request initiation and finish,
+     * including a failure or cancellation, or null if not collected.
+     */
+    @Nullable
+    public Long getTotalTimeMs() {
+        return mTotalTimeMs;
+    }
+
+    /**
+     * Returns total bytes sent over the network transport layer, or null if not collected.
+     */
+    @Nullable
+    public Long getSentBytesCount() {
+        return mSentBytesCount;
+    }
+
+    /**
+     * Returns total bytes received over the network transport layer, or null if not collected.
+     */
+    @Nullable
+    public Long getReceivedBytesCount() {
+        return mReceivedBytesCount;
+    }
+}