Opera has just released an early beta version of WebDriver for its Blink-based browsers. See https://github.com/operasoftware/operachromiumdriver
To indicate from the provided link:
OperaChromiumDriver can be used without additional configuration in versions of Opera based on Chromium starting from version 26. To drive Opera browsers based on Presto, refer to the OperaPrestoDriver project.
Although versions earlier than 26 are not officially supported, OperaXhromiumDriver v. 0.1.0 works with Opera 25. On Windows, you may need to use the "binary" option in "operaOptions".
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