* Put all Clang-Tidy warning messages in a group for now.
There are too many coding style warnings.
* Change the 'top' link to the top of the page.
* Add a few more new clang compiler warnings.
Bug: http://b/27779618
Change-Id: I385b9db927a397704b56f53440301352da8694cf
* The table of warning counts has links to each warning pattern section,
which has a new anchor.
* Each warning pattern section has a new link to the 'top' of the table
of warning counts.
* Background color of unknown warnings is changed to more visible light blue.
BUG: 27698849
Change-Id: Ia3d4a8511bd42f44f6a47afcb9c3889f6d62b9f2