[Chromecast] Log sample rate changes and tweak audio logging output.

chromecast/base/device_capabilities_impl.h

 // Copyright 2015 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 CHROMECAST_BASE_DEVICE_CAPABILITIES_IMPL_H_
 #define CHROMECAST_BASE_DEVICE_CAPABILITIES_IMPL_H_
 
+#include <string>
+
 #include "base/containers/scoped_ptr_hash_map.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/observer_list_threadsafe.h"
 #include "base/synchronization/lock.h"
 #include "chromecast/base/device_capabilities.h"
 
 namespace base {
 class SingleThreadTaskRunner;
 }
@@ skipping 70 matching lines @@
 
   ValidatorMap validator_map_;
   const scoped_refptr<base::ObserverListThreadSafe<Observer>> observer_list_;
 
   DISALLOW_COPY_AND_ASSIGN(DeviceCapabilitiesImpl);
 };
 
 }  // namespace chromecast
 
 #endif  // CHROMECAST_BASE_DEVICE_CAPABILITIES_IMPL_H_