Roll cros_system_api and use constants pulled in.

device/bluetooth/bluetooth_adapter.h

 // Copyright (c) 2012 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 DEVICE_BLUETOOTH_BLUETOOTH_ADAPTER_H_
 #define DEVICE_BLUETOOTH_BLUETOOTH_ADAPTER_H_
 
 #include <stdint.h>
 
 #include <list>
@@ skipping 426 matching lines @@
   // advertisement can unregister itself at any time by calling its unregister
   // function.
   virtual void RegisterAdvertisement(
       std::unique_ptr<BluetoothAdvertisement::Data> advertisement_data,
       const CreateAdvertisementCallback& callback,
       const AdvertisementErrorCallback& error_callback) = 0;
 
 #if defined(OS_CHROMEOS) || defined(OS_LINUX)
   // Sets the interval between two consecutive advertisements. Valid ranges
   // for the interval are from 20ms to 10.24 seconds, with min <= max.
+  // Note: This is a best effort. The actual interval may vary non-trivially
+  // from the requested intervals. On some hardware, there is a minimum
+  // interval of 100ms. The minimum and maximum values are specified by the
+  // Core 4.2 Spec, Vol 2, Part E, Section 7.8.5.
   virtual void SetAdvertisingInterval(
       const base::TimeDelta& min,
       const base::TimeDelta& max,
       const base::Closure& callback,
       const AdvertisementErrorCallback& error_callback) = 0;
 #endif
 
   // Returns the local GATT services associated with this adapter with the
   // given identifier. Returns NULL if the service doesn't exist.
   virtual BluetoothLocalGattService* GetGattService(
@@ skipping 167 matching lines @@
   std::set<BluetoothDiscoverySession*> discovery_sessions_;
 
   // Note: This should remain the last member so it'll be destroyed and
   // invalidate its weak pointers before any other members are destroyed.
   base::WeakPtrFactory<BluetoothAdapter> weak_ptr_factory_;
 };
 
 }  // namespace device
 
 #endif  // DEVICE_BLUETOOTH_BLUETOOTH_ADAPTER_H_