This directory contains the common Web Platform stuff that needs to be shared by renderer-side and browser-side code.
Things that live in third_party/blink can directly depend on this directory, while the code outside the Blink directory (e.g. //content and //chrome) can only depend on the common stuff via the public headers exposed in blink/public/common.
Anything in this directory should NOT depend on the non-common stuff in the Blink directory. See DEPS and BUILD.gn files for more details.
Code in this directory would normally use blink namespace.
Unlike other directories in Blink, code in this directory should:
Use Chromium‘s common types (e.g. //base ones) rather than Blink’s ones (e.g. WTF types)