Port progress events from devsite.

BUG= none
NOTRY=true (documentation-only change)
R=binji@chromium.org, eliben@chromium.org

Review URL: https://codereview.chromium.org/23583056

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@224738 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 224738
Optimize png files in ash/resources,  ui/resources

./tools/resources/optimize-png-files.sh -r217147 -o2 ash/resources/ ui/resources/

Processed 27 files (out of 86 files) in 00:09:00s
Result : 44724 => 19790 bytes (24934 bytes : 55 %)

BUG=297044
TBR=msw@chromium.org

Review URL: https://codereview.chromium.org/24375002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@224739 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 224739