Allow calling stats API functions before we have an isolate.

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 4125b3ce266f808a34672ca37d5495a4a21e24db..2a4fe138908a514cafa82741082040c52ac87054 100644
--- a/test/cctest/test-api.cc
+++ b/test/cctest/test-api.cc
@@ -13181,7 +13181,14 @@ TEST(MultipleIsolatesOnIndividualThreads) {
 
 class InitDefaultIsolateThread : public v8::internal::Thread {
  public:
-  enum TestCase { IgnoreOOM, SetResourceConstraints, SetFatalHandler };
+  enum TestCase {
+    IgnoreOOM,
+    SetResourceConstraints,
+    SetFatalHandler,
+    SetCounterFunction,
+    SetCreateHistogramFunction,
+    SetAddHistogramSampleFunction
+  };
 
   explicit InitDefaultIsolateThread(TestCase testCase)
       : Thread(NULL, "InitDefaultIsolateThread"),
@@ -13206,6 +13213,18 @@ class InitDefaultIsolateThread : public v8::internal::Thread {
     case SetFatalHandler:
       v8::V8::SetFatalErrorHandler(NULL);
       break;
+
+    case SetCounterFunction:
+      v8::V8::SetCounterFunction(NULL);
+      break;
+
+    case SetCreateHistogramFunction:
+      v8::V8::SetCreateHistogramFunction(NULL);
+      break;
+
+    case SetAddHistogramSampleFunction:
+      v8::V8::SetAddHistogramSampleFunction(NULL);
+      break;
     }
     result_ = true;
   }
@@ -13237,6 +13256,18 @@ TEST(InitializeDefaultIsolateOnSecondaryThread3) {
   InitializeTestHelper(InitDefaultIsolateThread::SetFatalHandler);
 }
 
+TEST(InitializeDefaultIsolateOnSecondaryThread4) {
+  InitializeTestHelper(InitDefaultIsolateThread::SetCounterFunction);
+}
+
+TEST(InitializeDefaultIsolateOnSecondaryThread5) {
+  InitializeTestHelper(InitDefaultIsolateThread::SetCreateHistogramFunction);
+}
+
+TEST(InitializeDefaultIsolateOnSecondaryThread6) {
+  InitializeTestHelper(InitDefaultIsolateThread::SetAddHistogramSampleFunction);
+}
+
 
 TEST(StringCheckMultipleContexts) {
   const char* code =