sandbox: sandbox_linux_unittests enforces TSYNC on ChromeOS

sandbox/linux/bpf_dsl/bpf_dsl_more_unittest.cc

Index: sandbox/linux/bpf_dsl/bpf_dsl_more_unittest.cc
diff --git a/sandbox/linux/bpf_dsl/bpf_dsl_more_unittest.cc b/sandbox/linux/bpf_dsl/bpf_dsl_more_unittest.cc
index 66669e796c69dbba717395c2a4772c96f5716aa3..1b58622a2fe3640cf7e3d9def57503ecb61148c4 100644
--- a/sandbox/linux/bpf_dsl/bpf_dsl_more_unittest.cc
+++ b/sandbox/linux/bpf_dsl/bpf_dsl_more_unittest.cc
@@ -2267,10 +2267,15 @@ void* TsyncApplyToTwoThreadsFunc(void* cond_ptr) {
 }
 
 SANDBOX_TEST(SandboxBPF, Tsync) {
-  if (SandboxBPF::SupportsSeccompThreadFilterSynchronization() !=
-      SandboxBPF::STATUS_AVAILABLE) {
+  SandboxBPF::SandboxStatus sandbox_status =
+      SandboxBPF::SupportsSeccompThreadFilterSynchronization();

[jln (very slow on Chromium), 2014/11/26 22:22:33]

This is a very outdated API, you should re-sync :)

+#if defined(OS_CHROMEOS)

[jln (very slow on Chromium), 2014/11/26 22:22:33]

This won't work unfortunately.

OS_CHROMEOS is just a type of build, that we run on Linux machines currently on
the WF.

We could ask infra to make sure that they're all running Trusty with updated
kernels, but that will take a little bit.

+  BPF_ASSERT_EQ(SandboxBPF::STATUS_AVAILABLE, sandbox_status);
+#else
+  if (sandbox_status != SandboxBPF::STATUS_AVAILABLE) {
     return;
   }
+#endif
 
   base::WaitableEvent event(true, false);