Add new framebuffer parameters that can be set with glFramebufferParameteri
and queried with glGetFramebufferParameteriv.
GL_FRAMEBUFFER DEFAULT WIDTH
GL_FRAMEBUFFER_DEFAULT_HEIGHT
GL_FRAMEBUFFER_DEFAULT_SAMPLES
GL_FRAMEBUFFER_DEFAULT_FIXED_SAMPLE_LOCATIONS

BUG=angleproject:1594
TEST=angle_unittests
TEST=angle_end2end_tests
TEST=dEQP-GLES31.functional.state_query.framebuffer_default.framebuffer_default*

Change-Id: I425e73a6b798fc7c73841ab98d7c8aabc381133d
Reviewed-on: https://chromium-review.googlesource.com/412126Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Geoff Lang <geofflang@chromium.org>