Implement create attribute API functions for BTLE.

chrome/browser/extensions/api/bluetooth_low_energy/bluetooth_low_energy_api.h

 // Copyright 2014 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 CHROME_BROWSER_EXTENSIONS_API_BLUETOOTH_LOW_ENERGY_BLUETOOTH_LOW_ENERGY_API_H_
 #define CHROME_BROWSER_EXTENSIONS_API_BLUETOOTH_LOW_ENERGY_BLUETOOTH_LOW_ENERGY_API_H_
 
 #include <string>
 
 #include "base/macros.h"
@@ skipping 110 matching lines @@
 
   // ExtensionFunction override.
   ResponseAction Run() override;
 
   // Implemented by individual bluetoothLowEnergy extension functions to perform
   // the body of the function. This invoked asynchonously after Run after
   // the BluetoothLowEnergyEventRouter has obtained a handle on the
   // BluetoothAdapter.
   virtual void DoWork() = 0;
 
+  BluetoothLowEnergyEventRouter* event_router_;
+
  private:
+  // Internal method to do common setup before actual DoWork is called.
+  void PreDoWork();
+
   DISALLOW_COPY_AND_ASSIGN(BluetoothLowEnergyExtensionFunction);
 };
 
 // Base class for bluetoothLowEnergy API peripheral mode functions. This class
 // handles some of the common logic involved in all API peripheral mode
 // functions, such as checking for peripheral permissions and returning the
 // correct error.
 template <typename Params>
 class BLEPeripheralExtensionFunction
     : public BluetoothLowEnergyExtensionFunction {
@@ skipping 412 matching lines @@
   ~BluetoothLowEnergySendRequestResponseFunction() override {}
 
   // BluetoothLowEnergyPeripheralExtensionFunction override.
   void DoWork() override;
 };
 
 }  // namespace api
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_BLUETOOTH_LOW_ENERGY_BLUETOOTH_LOW_ENERGY_API_H_