Implement framesDecoded stat in video receive ssrc stats.

webrtc/video/receive_statistics_proxy_unittest.cc

+/*
+ *  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.
+ */
+
+#include "webrtc/video/receive_statistics_proxy.h"
+
+#include <memory>
+
+#include "webrtc/test/gtest.h"
+
+namespace webrtc {
+
+// TODO(sakal): ReceiveStatisticsProxy is lacking unittesting.
+class ReceiveStatisticsProxyTest : public ::testing::Test {
+ public:
+  ReceiveStatisticsProxyTest() : fake_clock_(1234), config_(GetTestConfig()) {}
+  virtual ~ReceiveStatisticsProxyTest() {}
+
+ protected:
+  virtual void SetUp() {
+    statistics_proxy_.reset(new ReceiveStatisticsProxy(&config_, &fake_clock_));
+  }
+
+  VideoReceiveStream::Config GetTestConfig() {
+    VideoReceiveStream::Config config(nullptr);
+    return config;
+  }
+
+  SimulatedClock fake_clock_;
+  std::unique_ptr<ReceiveStatisticsProxy> statistics_proxy_;
+  VideoReceiveStream::Config config_;
+};
+
+TEST_F(ReceiveStatisticsProxyTest, OnDecodedFrameIncreasesFramesDecoded) {
+  EXPECT_EQ(0u, statistics_proxy_->GetStats().frames_decoded);
+  for (uint32_t i = 1; i <= 3; ++i) {
+    statistics_proxy_->OnDecodedFrame();
+    EXPECT_EQ(i, statistics_proxy_->GetStats().frames_decoded);
+  }
+}
+
+}  // namespace webrtc