Split NQE to multiple files

net/nqe/network_quality_observation_source.h

+// 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.
+
+#ifndef NET_NQE_NETWORK_QUALITY_OBSERVATION_SOURCE_H_
+#define NET_NQE_NETWORK_QUALITY_OBSERVATION_SOURCE_H_
+
+namespace net {
+
+// On Android, a Java counterpart will be generated for this enum.
+// GENERATED_JAVA_ENUM_PACKAGE: org.chromium.net
+// GENERATED_JAVA_CLASS_NAME_OVERRIDE: NetworkQualityObservationSource
+// GENERATED_JAVA_PREFIX_TO_STRIP: NETWORK_QUALITY_OBSERVATION_SOURCE_
+enum NetworkQualityObservationSource {
+  // The observation was taken at the request layer, e.g., a round trip time
+  // is recorded as the time between the request being sent and the first byte
+  // being received.
+  NETWORK_QUALITY_OBSERVATION_SOURCE_URL_REQUEST = 0,
+
+  // The observation is taken from TCP statistics maintained by the kernel.
+  NETWORK_QUALITY_OBSERVATION_SOURCE_TCP,
+
+  // The observation is taken at the QUIC layer.
+  NETWORK_QUALITY_OBSERVATION_SOURCE_QUIC,
+
+  // The observation is a previously cached estimate of the metric.
+  NETWORK_QUALITY_OBSERVATION_SOURCE_CACHED_ESTIMATE,
+
+  // The observation is derived from network connection information provided
+  // by the platform. For example, typical RTT and throughput values are used
+  // for a given type of network connection.
+  NETWORK_QUALITY_OBSERVATION_SOURCE_DEFAULT_FROM_PLATFORM,
+
+  // The observation came from a Chromium-external source.
+  NETWORK_QUALITY_OBSERVATION_SOURCE_EXTERNAL_ESTIMATE
+};
+
+}  // namespace net
+
+#endif  // NET_NQE_NETWORK_QUALITY_OBSERVATION_SOURCE_H_