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This enables the new Web Bluetooth BluetoothRemoteGattCharacteristic
writeValueWithResponse() and writeValueWithoutResponse() APIs on Win10,
Mac, Android and ChromeOS.

This has LGTM3 from blink-dev.
https://groups.google.com/a/chromium.org/forum/#!topic/blink-dev/1JE8tjylY3s

Bug: 672648
Change-Id: Iebcdb0c6c7daeb3aa230f0ec511a805655a0cdaa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2220694Reviewed-by: Mike West <mkwst@chromium.org>
Commit-Queue: David Lechner <david@pybricks.com>
Cr-Commit-Position: refs/heads/master@{#774613}