Add a couple more tests
Add a couple more tests

These tests were useful for debugging reference_trusted_thread.cc.
Test an easily-forwarded system call, dup().  Also test clone()
directly, in addition to testing it indirectly via pthread_create().
Check for leaked FDs.

Change the test runner to run all tests, even if one fails, rather
than stopping at the first failed test.

Review URL: http://codereview.chromium.org/1750014

BUG=none
TEST=none
Review URL: http://codereview.chromium.org/1756015

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@45806 0039d316-1c4b-4281-b951-d872f2087c98

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