Show account filters in navigation drawer

- Remove the blue rectangle and use a white background of height 24dp.
- Navigation drawer design: https://docs.google.com/a/google.com/document/d/1oVptSYWa84CGt2mIQxmRObLVqopJUUilZxlARCJaiMs/edit?usp=sharing
- The external text "labels" corresponds to "groups" in code; the text
  "Accounts" corresponds to "filters" in code.
- Avoid opening AccountFilterActivity from filter header.

Bug 27687799
Bug 28245667
Fixes 28245762
Fixes 28245372

Change-Id: I75efa2fca05a1c5b74051f43e342a61f937602a1