bluetooth: Browser-side implementation of getCharacteristic

device/bluetooth/test/mock_bluetooth_device.cc

Index: device/bluetooth/test/mock_bluetooth_device.cc
diff --git a/device/bluetooth/test/mock_bluetooth_device.cc b/device/bluetooth/test/mock_bluetooth_device.cc
index 928d98cb2939f541d77cc956268c02941a99df3d..0aa8448b3b8123b7ead169188599eb5447a0729b 100644
--- a/device/bluetooth/test/mock_bluetooth_device.cc
+++ b/device/bluetooth/test/mock_bluetooth_device.cc
@@ -71,4 +71,14 @@ std::vector<BluetoothGattService*> MockBluetoothDevice::GetMockServices()
   return services;
 }
 
+BluetoothGattService* MockBluetoothDevice::GetMockService(
+    const std::string& identifier) const {
+  for (BluetoothGattService* service : mock_services_) {
+    if (service->GetIdentifier() == identifier) {
+      return service;
+    }
+  }
+  return nullptr;
+}
+
 }  // namespace device