O2D: Implement the COPY_WITH_FADING paint operator, and change some of the other code to be simpler.
O2D: Implement the COPY_WITH_FADING paint operator, and change some of the other code to be simpler.

TEST=loaded O2D and verified COPY_WITH_FADING works
BUG=none

Review URL: http://codereview.chromium.org/6298011

git-svn-id: http://src.chromium.org/svn/trunk/src@72194 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: bfc93b0a4b4ae6e79e055b2610a17f1f821c8280
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser