Disable WebViewTest.Shim(resize-related) tests in software compositing mode.

BUG=295801
R=fsamuel@chromium.org, jbauman@chromium.org, joi@chromium.org, zmo@chromium.org

Review URL: https://codereview.chromium.org/23726050

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@224807 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 224807