Get DXVA working with Angle using Direct3D11.

This currently fails when we attempt to retrieve the shared decoding surface from ANGLE
which is eventually used to copy textures from DXVA to ANGLE.

Reason for failure is Direct3D11 does not support the EGL_TEXTURE_RGB attribute causing
the eglCreatePbufferSurface function to fail.

Fix based on a discussion with jbauman is to use the eglGetConfigAttrib function to check
if the EGL_BIND_TO_TEXTURE_RGB attribute is supported. If not we use the EGL_TEXTURE_RGBA
config attribute.

BUG=330271
R=jbauman@chromium.org, jbauman

Review URL: https://codereview.chromium.org/181843006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@254322 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 254322