Newer EGL functions use EGLAttrib to pass in attributes, which can be
either 32-bit or 64-bit depending on the system while the old attributes
are passed in as EGLints, which are usually 32-bits. To support these
newer functions, AttributeMap now uses EGLAttrib internally instead of
EGLint, and all the code using AttributeMap has been updated to cast
properly.

BUG=angleproject:1348

Change-Id: I7c4dd9ef23ea1b1741f3a565502fb5e26bf962d7
Reviewed-on: https://chromium-review.googlesource.com/337162Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Ian Ewell <ewell@google.com>