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Fix bugs in attrib-type-match.html

BUG=628459
TEST=conformance2/rendering/attrib-type-match.html
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel

Review-Url: https://codereview.chromium.org/2148723004
Cr-Commit-Position: refs/heads/master@{#407168}