Add the chrome.bluetoothLowEnergy.setAdvertisingInterval API.

device/bluetooth/dbus/bluetooth_le_advertising_manager_client.h

Index: device/bluetooth/dbus/bluetooth_le_advertising_manager_client.h
diff --git a/device/bluetooth/dbus/bluetooth_le_advertising_manager_client.h b/device/bluetooth/dbus/bluetooth_le_advertising_manager_client.h
index 33b66a5ab5d0d64de63aa1c8aa948b62153dadc1..4a338ada7254657f0ae4128d29f20eaad4cebcff 100644
--- a/device/bluetooth/dbus/bluetooth_le_advertising_manager_client.h
+++ b/device/bluetooth/dbus/bluetooth_le_advertising_manager_client.h
@@ -5,6 +5,7 @@
 #ifndef DEVICE_BLUETOOTH_DBUS_BLUETOOTH_LE_ADVERTISING_MANAGER_CLIENT_H_
 #define DEVICE_BLUETOOTH_DBUS_BLUETOOTH_LE_ADVERTISING_MANAGER_CLIENT_H_
 
+#include <cstdint>
 #include <memory>
 #include <string>
 #include <vector>
@@ -67,6 +68,14 @@ class DEVICE_BLUETOOTH_EXPORT BluetoothLEAdvertisingManagerClient
       const base::Closure& callback,
       const ErrorCallback& error_callback) = 0;
 
+  // Set's the advertising interval.
+  virtual void SetAdvertisingInterval(
+      const dbus::ObjectPath& manager_object_path,
+      uint16_t min_interval_ms,
+      uint16_t max_interval_ms,
+      const base::Closure& callback,
+      const ErrorCallback& error_callback) = 0;
+
   // Creates the instance.
   static BluetoothLEAdvertisingManagerClient* Create();