BUG=angleproject:1160

This is the first step to BUG=angleproject:1160, optimizing
GetTextureFormatInfo to use static switching rather than building maps and
using the find function. Also reordered the includes in alphabetical,
src files first format

The next step is to modify the GetTextureFormatInfo not to build a map but
to use static switching. The step after that is to use a JSON generator to
generate the switching, hence refactoring TextureFormat to be in its own
class so we only need to generate what's necesary. The helper functions
such as swizzle texture format can also be done using the same approach.
Hence, they're also refactored into their own files.

Change-Id: I753f437ca0df69ee5584d254fe0d2ea8b09a857e
Reviewed-on: https://chromium-review.googlesource.com/300288Reviewed-by: Jamie Madill <jmadill@chromium.org>
Tryjob-Request: Jamie Madill <jmadill@chromium.org>
Tested-by: Dian Xiang <dianx@google.com>