Conditionally enable browser_startup_time test (when no outer sandbox). This test depends on NACLLOG, which can only open a file when the outer sandbox is disabled (yay the outersandbox works!).
Conditionally enable browser_startup_time test (when no outer sandbox).
This test depends on NACLLOG, which can only open a file when the
outer sandbox is disabled (yay the outersandbox works!).

Assumes that we will only run this performance test in an environment
that does not have have the outer sandbox enabled. Alternatively,
we could pass --no-sandbox in the browser_tester when running this test?

BUG= http://code.google.com/p/nativeclient/issues/detail?id=1833
TEST=
./scons performance_tests irt=1 disable_dynamic_plugin_loading=1
skips the test
./scons performance_tests irt=1
runs the test
Review URL: http://codereview.chromium.org/6961030

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@5391 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

nacl-webkit/native_client,sbc100/native_client,nacl-webkit/native_client,nacl-webkit/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,nacl-webkit/native_client,sbc100/native_client,nacl-webkit/native_client