Add the chrome.bluetoothLowEnergy.setAdvertisingInterval API.

device/bluetooth/test/mock_bluetooth_adapter.h

Index: device/bluetooth/test/mock_bluetooth_adapter.h
diff --git a/device/bluetooth/test/mock_bluetooth_adapter.h b/device/bluetooth/test/mock_bluetooth_adapter.h
index a59674097a8992d4a592e0f78e829fbcecc0f334..880dd4c92fe9028add83ff279300de3c4b7d73e7 100644
--- a/device/bluetooth/test/mock_bluetooth_adapter.h
+++ b/device/bluetooth/test/mock_bluetooth_adapter.h
@@ -137,7 +137,14 @@ class MockBluetoothAdapter : public BluetoothAdapter {
   void RegisterAdvertisement(
       std::unique_ptr<BluetoothAdvertisement::Data> advertisement_data,
       const CreateAdvertisementCallback& callback,
-      const CreateAdvertisementErrorCallback& error_callback) override;
+      const AdvertisementErrorCallback& error_callback) override;
+#if defined(OS_CHROMEOS) || defined(OS_LINUX)
+  void SetAdvertisingInterval(
+      const base::TimeDelta& min,
+      const base::TimeDelta& max,
+      const base::Closure& callback,
+      const AdvertisementErrorCallback& error_callback) override;
+#endif
   virtual ~MockBluetoothAdapter();
 
   MOCK_METHOD1(RemovePairingDelegateInternal,