w pixels * 4 channels * 8 bits/channel / 8 bits/byte = w * 4 bytes/row
w pixels * 4 channels * 8 bits/channel / 8 bits/byte = w * 4 bytes/row

BUG=26989
TEST=Things should paint even when scrolling.
Review URL: http://codereview.chromium.org/376026

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@31474 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