Document base::Bind*() and base::Callback*() in the headers.

Add basic documentation in the headers, so some of the invariants and
basic usage are more obvious without having to refer to a separate
Markdown document.

Change-Id: Ic14350c8745ba95c05f62be17760fb02c6f7bfef
Reviewed-on: https://chromium-review.googlesource.com/924744
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Taiju Tsuiki <tzik@chromium.org>
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#537688}

CrOS-Libchrome-Original-Commit: b9d99f5f6261110d728faa47c12bf7668d6566e8
2 files changed
tree: 334a31252d0e518ee3a7647c62d4d3423b77e436
  1. base/
  2. build/
  3. components/
  4. dbus/
  5. device/
  6. ipc/
  7. mojo/
  8. testing/
  9. third_party/
  10. ui/