This is a tracking bug for the support library being code complete - this includes
1. all support-library side code being added (in the Android Support Library).
2. chromium-side changes


This does not include adding all of the tests we want to add for the support library (e.g. ensuring that an app can link two different versions of the support library) - so being code complete here does not necessarily mean that the code is up to the standard we require for it being released.

The current target for being code complete is M65 - the code would be landed by the end of the year.