Refactor ZLib and Verbatim encoders.
Refactor ZLib and Verbatim encoders.

Added EncoderRowBased that implements encoding for both ZLib and Verbatim.

BUG=None
TEST=None

Review URL: http://codereview.chromium.org/5382008

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@68384 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser