The API to control network emulation were added to ChromeDriver. And should be available for quite a while now. According to comment in the linked issue you should use version at least 2.26 because of some bugfix.
According to Selenium changelog bindings are available for these languages:
- JavaScript as of version 3.4.0 (commit)
- Python as of version 3.5.0 (commit)
- Ruby as of version 3.11.0 (commit)
- C# as of version 4 (commit)
If you need these binding in other languages you should probably open issue/contribute implementation similar to one of the above.
Example usage from Python is below:
driver.set_network_conditions(
offline=False,
latency=5, # additional latency (ms)
download_throughput=500 * 1024, # maximal throughput
upload_throughput=500 * 1024) # maximal throughput