bluetooth: mac: Initial BluetoothRemoteGattCharacteristicMac implementation

device/bluetooth/test/mock_bluetooth_cbservice_mac.mm

Index: device/bluetooth/test/mock_bluetooth_cbservice_mac.mm
diff --git a/device/bluetooth/test/mock_bluetooth_cbservice_mac.mm b/device/bluetooth/test/mock_bluetooth_cbservice_mac.mm
index 48337c8e95a47e31605d4d70dc1e1dd502f15133..a13be146fa69c1372dc87e53968f7d12fc41ec8f 100644
--- a/device/bluetooth/test/mock_bluetooth_cbservice_mac.mm
+++ b/device/bluetooth/test/mock_bluetooth_cbservice_mac.mm
@@ -7,6 +7,7 @@
 #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;
@@ -14,6 +15,7 @@ using base::scoped_nsobject;
 @interface MockCBService () {
   scoped_nsobject<CBUUID> _UUID;
   BOOL _primary;
+  scoped_nsobject<NSMutableArray> _characteristics;
 }
 
 @end
@@ -27,6 +29,7 @@ using base::scoped_nsobject;
   if (self) {
     _UUID.reset([uuid retain]);
     _primary = isPrimary;
+    _characteristics.reset([[NSMutableArray alloc] init]);
   }
   return self;
 }
@@ -51,8 +54,19 @@ using base::scoped_nsobject;
   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