RTCDataChannelStats added.

webrtc/api/test/mock_datachannel.h

 /*
  *  Copyright 2016 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #ifndef WEBRTC_API_TEST_MOCK_DATACHANNEL_H_
 #define WEBRTC_API_TEST_MOCK_DATACHANNEL_H_
 
 #include "webrtc/api/datachannel.h"
 #include "webrtc/test/gmock.h"
 
 namespace webrtc {
 
 class MockDataChannel : public rtc::RefCountedObject<DataChannel> {
  public:
-  explicit MockDataChannel(DataState state)
+  MockDataChannel(int id, DataState state)
+      : MockDataChannel(id, state, 0, 0, 0, 0) {
+  }

[Taylor Brandstetter, 2016/10/18 17:28:11]

Instead of these constructors, why not use EXPECT_CALL in the unit test itself?
That would make the unit test more clear. But I guess we've already started the
pattern with this object, so little point in changing it now.

[hbos, 2016/10/18 19:13:38]

Acknowledge. I could create a helper function that creates and does EXPECT to
avoid this pattern here if you want to? But landing this as-is.

+  MockDataChannel(
+      int id,
+      DataState state,
+      uint32_t messages_sent,
+      uint64_t bytes_sent,
+      uint32_t messages_received,
+      uint64_t bytes_received)
       : rtc::RefCountedObject<DataChannel>(
             nullptr, cricket::DCT_NONE, "MockDataChannel") {
+    EXPECT_CALL(*this, id()).WillRepeatedly(testing::Return(id));
     EXPECT_CALL(*this, state()).WillRepeatedly(testing::Return(state));
+    EXPECT_CALL(*this, messages_sent()).WillRepeatedly(
+        testing::Return(messages_sent));
+    EXPECT_CALL(*this, bytes_sent()).WillRepeatedly(
+        testing::Return(bytes_sent));
+    EXPECT_CALL(*this, messages_received()).WillRepeatedly(
+        testing::Return(messages_received));
+    EXPECT_CALL(*this, bytes_received()).WillRepeatedly(
+        testing::Return(bytes_received));
   }
+  MOCK_CONST_METHOD0(id, int());
   MOCK_CONST_METHOD0(state, DataState());
+  MOCK_CONST_METHOD0(messages_sent, uint32_t());
+  MOCK_CONST_METHOD0(bytes_sent, uint64_t());
+  MOCK_CONST_METHOD0(messages_received, uint32_t());
+  MOCK_CONST_METHOD0(bytes_received, uint64_t());
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_API_TEST_MOCK_DATACHANNEL_H_