Add the chrome.bluetoothLowEnergy.setAdvertisingInterval API.

device/bluetooth/dbus/fake_bluetooth_le_advertising_manager_client.h

Index: device/bluetooth/dbus/fake_bluetooth_le_advertising_manager_client.h
diff --git a/device/bluetooth/dbus/fake_bluetooth_le_advertising_manager_client.h b/device/bluetooth/dbus/fake_bluetooth_le_advertising_manager_client.h
index ae0d914115b251e349132dd2da6fa5f438a3efc1..bd7826f42d263846c40053f98a994e369ade7f8f 100644
--- a/device/bluetooth/dbus/fake_bluetooth_le_advertising_manager_client.h
+++ b/device/bluetooth/dbus/fake_bluetooth_le_advertising_manager_client.h
@@ -47,6 +47,12 @@ class DEVICE_BLUETOOTH_EXPORT FakeBluetoothLEAdvertisingManagerClient
       const base::Closure& callback,
       const ErrorCallback& error_callback) override;
 
+  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) override;
+
   // Register, unregister and retrieve pointers to profile server providers.
   void RegisterAdvertisementServiceProvider(
       FakeBluetoothLEAdvertisementServiceProvider* service_provider);
@@ -55,9 +61,6 @@ class DEVICE_BLUETOOTH_EXPORT FakeBluetoothLEAdvertisingManagerClient
   FakeBluetoothLEAdvertisementServiceProvider* GetAdvertisementServiceProvider(
       const std::string& uuid);
 
-  // Advertising manager path that we simulate.
-  static const char kAdvertisingManagerPath[];
-
  private:
   // Map of a D-Bus object path to the FakeBluetoothAdvertisementServiceProvider
   // registered for it; maintained by RegisterAdvertisementServiceProvider() and