The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/e1515160a2cb782649b52d028fec8bc557e2055e

commit e1515160a2cb782649b52d028fec8bc557e2055e
Author: Devlin Cronin <rdevlin.cronin@chromium.org>
Date: Fri Jul 06 16:14:57 2018

[Extensions Docs] Add documentation for API function implementation

Extension API functions are a pretty vital part of the extension system.
Add some basic documentation for how extension API functions work, and a
few best practices.

Bug: 859549
TBR=dbertoni@chromium.org

Change-Id: Ieae535868346b13215f2af4c61f3d3716a760132
Reviewed-on: https://chromium-review.googlesource.com/1122848
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Istiaque Ahmed <lazyboy@chromium.org>
Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#572983}
[add] https://crrev.com/e1515160a2cb782649b52d028fec8bc557e2055e/extensions/docs/api_functions.md