Set framebuffer default params with glFramebufferParameteri and
glGetFramebufferParameteriv, keep framebuffer default parameters
in cache for query.
The es 3.1 spec section 9.2 states that, "If there are no attachments
, rendering will be limited to a rectangle having a lower left of
(0, 0) and an upper right of (width, height), where width and height
are the framebuffer object's default width and height."
If the Framebuffer has no color attachment and the default width or
height is smaller than the current viewport, use the smaller of the
two sizes.

BUG=angleproject:1594
TEST=dEQP-GLES31.functional.state_query.framebuffer_default.framebuffer_default*
TEST=dEQP-GLES31.functional.fbo.completeness.no_attachments
TEST=dEQP-GLES31.functional.fbo.no_attachments.*
TEST=angle_end2end_tests --gtest_filter=FramebufferTest_ES31.*

Change-Id: I8041fd655161390acf115efa08ce0f04b10810a0
Reviewed-on: https://chromium-review.googlesource.com/609414
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>