Increase size of output buffer for pix to 32768

Increase size of output buffer for pix to 32768

We output entire hlsl shaders into this buffer, so 4096 bytes was too small.


BUG=
TEST=

Committed: https://code.google.com/p/angleproject/source/detail?r=953

[dgkoch, 2012-01-20 15:14:34]

I suppose 32K won't be big enough for some shaders either, but it'll get any
sane one :-)

LTGM.