fgimenez: Add allow-same-origin to deck/spyglass sandbox

JobBuild
22921
07-31 16:13
pull-test-infra-bazel 1421872469886636032 1421504194073858048
pull-test-infra-integration 1421872470016659456 1421504194174521344
pull-test-infra-unit-test 1447706000848064512
pull-test-infra-verify-file-perms 1421872469928579072 1421504194107412480
pull-test-infra-yamllint 1421872469970522112 1421504194140966912