[BlackBerry] Add support for JPEG image quality during encoding.
https://bugs.webkit.org/show_bug.cgi?id=105773

Patch by George Staikos <gstaikos@rim.com> on 2013-04-24
Reviewed by Xan Lopez.

PR 271611
Internally reviewed by Liam Quinn.

Pass the quality flag into the encoder, with a default of 65

Covered by existing tests.

* platform/image-encoders/JPEGImageEncoder.cpp:
(WebCore::compressRGBABigEndianToJPEG):
* platform/image-encoders/JPEGImageEncoder.h:
(WebCore):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@149033 268f45cc-cd09-0410-ab3c-d52691b4dbfc