Initial implementation of GetStackSample sampling profiler API.

test/cctest/test-api.cc

Index: test/cctest/test-api.cc
diff --git a/test/cctest/test-api.cc b/test/cctest/test-api.cc
index 8fd87434c1b27aaeb5c31ce8af06026aa834cc62..11a7ac14689a6df1d96b39ef2e020c58adcec301 100644
--- a/test/cctest/test-api.cc
+++ b/test/cctest/test-api.cc
@@ -934,7 +934,7 @@ static void CheckReturnValue(const T& t, i::Address callback) {
   // If CPU profiler is active check that when API callback is invoked
   // VMState is set to EXTERNAL.
   if (isolate->cpu_profiler()->is_profiling()) {
-    CHECK_EQ(i::EXTERNAL, isolate->current_vm_state());
+    CHECK_EQ(v8::EXTERNAL, isolate->current_vm_state());
     CHECK(isolate->external_callback_scope());
     CHECK_EQ(callback, isolate->external_callback_scope()->callback());
   }