Suppress Clang compilation warnings.

Ignore warnings about unused parameters and initialization of static
constant float data members.

Change one potential error of allocating variable length
array of non-POD element type on stack.

Fix mismatch of class and struct declaration tags.

BUG: 17512760
Change-Id: I3a09c945fb1c17f27aff74a7e439dd4c35d1fb32