Add a basic smoketest for gpu rasterization.

BUG=347783
R=bajones@chromium.org, kbr@chromium.org

Review URL: https://codereview.chromium.org/181043007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@254552 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 254552
Mojo: Add a GetType() to MessagePipeEndpoint.

This isn't absolutely required, but it's useful (and will soon be even
more useful) for assertions.

R=darin@chromium.org

Review URL: https://codereview.chromium.org/176863006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@254553 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 254553