Add new ANA stats to GetStats() to count the number of actions taken by each controller.

webrtc/common_types.cc

 /*
  *  Copyright (c) 2012 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.
  */
 
@@ skipping 247 matching lines @@
   RTC_DCHECK_EQ(spatial_cumulator, sum_);
   oss << " ]";
   return oss.str();
 }
 
 std::ostream& BitrateAllocation::operator<<(std::ostream& os) const {
   os << ToString();
   return os;
 }
 
+ANAStats::ANAStats() = default;
+ANAStats::~ANAStats() = default;
+ANAStats::ANAStats(const ANAStats&) = default;
+
 }  // namespace webrtc