Change quality settings on SkImageDecoder_libjpeg

It has been demonstrated that higher quality settings
really do make a difference in the visual quality of
the output image.
https://code.google.com/p/chromium/issues/detail?id=385515
https://code.google.com/p/skia/issues/detail?id=3770

We are planning to replace SkImageDecoder with SkCodec,
and SkCodec will use the higher quality settings.  As
a first step, we are using SkCodec as the underlying
implementation for BitmapRegionDecoder.  CTS tests require
that BitmapRegionDecoder be a close match to BitmapFactory
(which uses SkImageDecoder), so we must also update the
quality of SkImageDecoder to maintain CTS compatibility.

BUG=skia:

Review URL: https://codereview.chromium.org/1412803009

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