Migrate test-semaphore to base-unittests.

Migrate test-semaphore to base-unittests.

TEST=base-unittests
BUG=v8:3489
LOG=n
R=machenbach@chromium.org

Committed: https://code.google.com/p/v8/source/detail?r=23296

[Michael Achenbach, 2014-08-22 08:21:07]

lgtm

https://codereview.chromium.org/494343002/diff/1/test/base-unittests/platform...
File test/base-unittests/platform/semaphore-unittest.cc (right):

https://codereview.chromium.org/494343002/diff/1/test/base-unittests/platform...
test/base-unittests/platform/semaphore-unittest.cc:123:
EXPECT_FALSE(semaphore.WaitFor(TimeDelta::FromMicroseconds(1)));
What's the difference to ASSERT_FALSE above?

https://codereview.chromium.org/494343002/diff/1/test/base-unittests/platform...
test/base-unittests/platform/semaphore-unittest.cc:133:
ASSERT_FALSE(semaphore.WaitFor(TimeDelta::FromMicroseconds(1000)));
Do we really need the last one? What could make that break?

[Benedikt Meurer, 2014-08-22 08:51:58]

https://codereview.chromium.org/494343002/diff/1/test/base-unittests/platform...
File test/base-unittests/platform/semaphore-unittest.cc (right):

https://codereview.chromium.org/494343002/diff/1/test/base-unittests/platform...
test/base-unittests/platform/semaphore-unittest.cc:123:
EXPECT_FALSE(semaphore.WaitFor(TimeDelta::FromMicroseconds(1)));
EXPECT_* just record a failure, while ASSERT_* terminates the current test.

[Benedikt Meurer, 2014-08-22 08:52:50]

Committed patchset #1 manually as 23296 (presubmit successful).