commit bc1fcc54f721c1c3821fa9002dd57eaa74b849e8
author weiliangc@chromium.org <weiliangc@chromium.org@0039d316-1c4b-4281-b951-d872f2087c98> Tue Jun 10 22:13:03 2014
committer weiliangc@chromium.org <weiliangc@chromium.org@0039d316-1c4b-4281-b951-d872f2087c98> Tue Jun 10 22:13:03 2014
tree 10562bef7cc5ca08930f19c9f9286c4030cde7c6
parent bc887fda7969787b267e8f5ac4e52195ab84e55c

Paint state transition for overlay 9 patch scrollbars

Add functionality to paint overlay scrollbar thumbs when it's between
different states (Normal/Hover/Pressed). Mainly paint linear transition
state of opacity for 9 patch scrollbar resources.

Blink side of change is 246293006.

BUG=307578

Review URL: https://codereview.chromium.org/238723004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@276177 0039d316-1c4b-4281-b951-d872f2087c98