test added in crrev.com/4f5e732f00545db86e

bot: https://uberchromegw.corp.google.com/i/chromium.memory/builders/Linux%20Chromium%20OS%20ASan%20LSan%20Tests%20%281%29/builds/17732

e.g.,
Direct leak of 16 byte(s) in 1 object(s) allocated from:
    #0 0x525afb in operator new(unsigned long) (/b/swarm_slave/w/irUt5llM/out/Release/aura_unittests+0x525afb)
    #1 0x18d240c in aura::PropertyConverter::SetPropertyFromTransportValue(aura::Window*, std::string const&, std::vector<unsigned char, std::allocator<unsigned char> > const*) ui/aura/mus/property_converter.cc:117:48
    #2 0x679d21 in aura::PropertyConverterTest_RectProperty_Test::TestBody() ui/aura/mus/property_converter_unittest.cc:161:22
    #3 0x17c935b in HandleExceptionsInMethodIfSupported<testing::Test, void> testing/gtest/src/gtest.cc:2458:12
    #4 0x17c935b in testing::Test::Run() testing/gtest/src/gtest.cc:2474
    #5 0x17cb46b in testing::TestInfo::Run() testing/gtest/src/gtest.cc:2656:11
    #6 0x17cc226 in testing::TestCase::Run() testing/gtest/src/gtest.cc:2774:28
    #7 0x17dff96 in testing::internal::UnitTestImpl::RunAllTests() testing/gtest/src/gtest.cc:4647:43
    #8 0x17df5d7 in HandleExceptionsInMethodIfSupported<testing::internal::UnitTestImpl, bool> testing/gtest/src/gtest.cc:2458:12
    #9 0x17df5d7 in testing::UnitTest::Run() testing/gtest/src/gtest.cc:4255
    #10 0xc186a8 in RUN_ALL_TESTS testing/gtest/include/gtest/gtest.h:2237:46
    #11 0xc186a8 in base::TestSuite::Run() base/test/test_suite.cc:246
    #12 0xc1baba in Run base/callback.h:64:12
    #13 0xc1baba in base::(anonymous namespace)::LaunchUnitTestsInternal(base::Callback<int (), (base::internal::CopyMode)1, (base::internal::RepeatMode)1> const&, int, int, bool, base::Callback<void (), (base::internal::CopyMode)1, (base::internal::RepeatMode)1> const&) base/test/launcher/unit_test_launcher.cc:211
    #14 0xc1b71e in base::LaunchUnitTests(int, char**, base::Callback<int (), (base::internal::CopyMode)1, (base::internal::RepeatMode)1> const&) base/test/launcher/unit_test_launcher.cc:453:10
    #15 0x6d9805 in main ui/aura/test/run_all_unittests.cc:37:10
    #16 0x7f37d10967ec in __libc_start_main /build/eglibc-oqps9y/eglibc-2.15/csu/libc-start.c:226