Fix result status of rerun flaky tests.

Tests that pass on reruns where wrongly treated as failures. Now the result state can include any of (PASS, FAIL, CRASH, TIMEOUT)

BUG=374134
LOG=n
R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/363883003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22186 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Add an API to pump the message loop to libplatform

BUG=none
LOG=n
R=marja@chromium.org

Review URL: https://codereview.chromium.org/363303002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22187 ce2b1a6d-e550-0410-aec6-3dcde31c8c00