Implemented transparent gradients

R=vandebo@chromium.org, edisonn@google.com

Author: richardlin@chromium.org

Review URL: https://chromiumcodereview.appspot.com/18585002

git-svn-id: http://skia.googlecode.com/svn/trunk@10297 2bbb7eff-a529-9590-31e7-b0007b416f81
9 files changed