Disabled newly added visible content rect tests.

Tests were broken on Android. Disabling to allow a Blink roll while I
fix the tests.

TBR=bokan@chromium.org

Review URL: https://codereview.chromium.org/162613009

git-svn-id: svn://svn.chromium.org/blink/trunk@167430 bbb929c8-8fbe-4397-9dbb-9b2b20218538