bluetooth: mac: Initial BluetoothRemoteGattCharacteristicMac implementation

device/bluetooth/test/mock_bluetooth_cbservice_mac.mm

 // 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 "device/bluetooth/test/mock_bluetooth_cbservice_mac.h"
 
 #include "base/mac/foundation_util.h"
 #include "base/mac/scoped_nsobject.h"
 #include "device/bluetooth/test/bluetooth_test.h"
+#include "device/bluetooth/test/mock_bluetooth_cbcharacteristic_mac.h"
 
 using base::mac::ObjCCast;
 using base::scoped_nsobject;
 
 @interface MockCBService () {
   scoped_nsobject<CBUUID> _UUID;
   BOOL _primary;
+  scoped_nsobject<NSMutableArray> _characteristics;
 }
 
 @end
 
 @implementation MockCBService
 
 @synthesize isPrimary = _primary;
 
 - (instancetype)initWithCBUUID:(CBUUID*)uuid primary:(BOOL)isPrimary {
   self = [super init];
   if (self) {
     _UUID.reset([uuid retain]);
     _primary = isPrimary;
+    _characteristics.reset([[NSMutableArray alloc] init]);
   }
   return self;
 }
 
 - (BOOL)isKindOfClass:(Class)aClass {
   if (aClass == [CBService class] ||
       [aClass isSubclassOfClass:[CBService class]]) {
     return YES;
   }
   return [super isKindOfClass:aClass];
 }
 
 - (BOOL)isMemberOfClass:(Class)aClass {
   if (aClass == [CBService class] ||
       [aClass isSubclassOfClass:[CBService class]]) {
     return YES;
   }
   return [super isKindOfClass:aClass];
 }
 
 - (CBUUID*)UUID {
   return _UUID.get();
 }
 
+- (void)addCharacteristicWithUUID:(CBUUID*)cb_uuid properties:(int)properties {
+  scoped_nsobject<MockCBCharacteristic> characteristic_mock(
+      [[MockCBCharacteristic alloc] initWithCBUUID:cb_uuid
+                                        properties:properties]);
+  [_characteristics.get() addObject:characteristic_mock];
+}
+
 - (CBService*)service {
   return ObjCCast<CBService>(self);
 }
 
+- (NSArray*)characteristics {
+  return _characteristics.get();
+}
+
 @end