Fix up some canvas expectations.

TBR=
BUG=

Review URL: https://codereview.chromium.org/17583002

git-svn-id: svn://svn.chromium.org/blink/trunk@152935 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Add button.png

This CL adds a binary file from https://codereview.chromium.org/16520007/. The
binary file is marking it hard to land this CL via the commit-queue.

TBR=tiger@opera.com

Review URL: https://codereview.chromium.org/17584002

git-svn-id: svn://svn.chromium.org/blink/trunk@152936 bbb929c8-8fbe-4397-9dbb-9b2b20218538