Reserve experiment IDs for WebGLDebugRendererInfo finch experiment.

This is to make it GWS visible.

BUG=313396
TEST=
R=asvitkine@chromium.org

Review URL: https://codereview.chromium.org/81393002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@236581 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 236581