[CrOS Tether] Create BleScanner, a class which scan BLE advertisements and identifies nearby device…

components/cryptauth/mock_eid_generator.cc

 // Copyright 2016 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.
 
 #include "components/cryptauth/mock_eid_generator.h"
 
 #include "base/memory/ptr_util.h"
 
 namespace cryptauth {
 
 MockEidGenerator::MockEidGenerator() : background_scan_filter_(nullptr),
                                        advertisement_(nullptr),
                                        possible_advertisements_(nullptr),
-                                       identified_device_(nullptr) {}
+                                       identified_device_(nullptr),
+                                       num_identify_calls_(0) {}
 
 MockEidGenerator::~MockEidGenerator() {}
 
 std::unique_ptr<EidGenerator::EidData>
 MockEidGenerator::GenerateBackgroundScanFilter(
     const std::vector<BeaconSeed>& scanning_device_beacon_seeds) const {
   if (!background_scan_filter_) {
     return nullptr;
   }
 
@@ skipping 30 matching lines @@
     return std::vector<std::string>();
   }
 
   return *possible_advertisements_;
 }
 
 RemoteDevice const* MockEidGenerator::IdentifyRemoteDeviceByAdvertisement(
     const std::string& advertisement_service_data,
     const std::vector<RemoteDevice>& device_list,
     const std::vector<BeaconSeed>& scanning_device_beacon_seeds) const {
+  // Increment num_identify_calls_. Since this overrides a const method, some
+  // hacking is needed to modify the num_identify_calls_ instance variable.
+  int* num_identify_calls_ptr = const_cast<int*>(&num_identify_calls_);
+  *num_identify_calls_ptr = *num_identify_calls_ptr + 1;
+
   return identified_device_;
 }
 
 }  // namespace cryptauth