Change the max reported viewport size to be the same as the maximum texture size in D3D11.
Change the max reported viewport size to be the same as the maximum texture size in D3D11.

This fixes a regression in the WebGL conformance test "drawingbuffer-test".

TRAC #22582

Signed-off-by: Geoff Lang
Signed-off-by: Nicolas Capens
Author: Jamie Madill

git-svn-id: 2a1ef23f1c4b6a1dbccd5f9514022461535c55c0@1912 736b8ea6-26fd-11df-bfd4-992fa37f6226

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