Set up NaClChromeMainArgs number_of_cores member so apps can size threadpools appropriately

chrome/nacl/nacl_main.cc

Index: chrome/nacl/nacl_main.cc
diff --git a/chrome/nacl/nacl_main.cc b/chrome/nacl/nacl_main.cc
index 9b7a8c6b95dbf227b37a6a02799a97dcf7075d8e..a7c11247ba6a103b3928c90cc7abc5af05f937a1 100644
--- a/chrome/nacl/nacl_main.cc
+++ b/chrome/nacl/nacl_main.cc
@@ -33,6 +33,12 @@ int NaClMain(const content::MainFunctionParams& parameters) {
   bool no_sandbox = parsed_command_line.HasSwitch(switches::kNoSandbox);
   platform.InitSandboxTests(no_sandbox);
 
+#if defined(OS_POSIX)
+  // The number of cores must be obtained before the invocation of
+  // platform.EnableSandbox(), so cannot simply be inlined below.
+  int number_of_cores = sysconf(_SC_NPROCESSORS_ONLN);
+#endif
+
   if (!no_sandbox) {
     platform.EnableSandbox();
   }
@@ -40,6 +46,9 @@ int NaClMain(const content::MainFunctionParams& parameters) {
 
   if (sandbox_test_result) {
     NaClListener listener;
+#if defined(OS_POSIX)
+    listener.set_number_of_cores(number_of_cores);
+#endif
     listener.Listen();
   } else {
     // This indirectly prevents the test-harness-success-cookie from being set,