[heap] Add --stress-incremental-marking flag.

test/cctest/test-heap-profiler.cc

Index: test/cctest/test-heap-profiler.cc
diff --git a/test/cctest/test-heap-profiler.cc b/test/cctest/test-heap-profiler.cc
index b96e1615669ef1574aec21ce34d244d23aabc538..552434ed8b5faeb2df65963dbcf24c1caee7438d 100644
--- a/test/cctest/test-heap-profiler.cc
+++ b/test/cctest/test-heap-profiler.cc
@@ -2021,6 +2021,7 @@ bool HasWeakGlobalHandle() {
 static void PersistentHandleCallback(
     const v8::WeakCallbackInfo<v8::Persistent<v8::Object> >& data) {
   data.GetParameter()->Reset();
+  delete data.GetParameter();
 }
 
 
@@ -2030,12 +2031,16 @@ TEST(WeakGlobalHandle) {
 
   CHECK(!HasWeakGlobalHandle());
 
-  v8::Persistent<v8::Object> handle(env->GetIsolate(),
-                                    v8::Object::New(env->GetIsolate()));
-  handle.SetWeak(&handle, PersistentHandleCallback,
-                 v8::WeakCallbackType::kParameter);
+  // We cannot stack allocate the handle because the weak callback
+  // can be invoked in the message loop after returning from this function.
+  v8::Persistent<v8::Object>* handle = new v8::Persistent<v8::Object>();
+
+  handle->Reset(env->GetIsolate(), v8::Object::New(env->GetIsolate()));
+  handle->SetWeak(handle, PersistentHandleCallback,
+                  v8::WeakCallbackType::kParameter);
 
   CHECK(HasWeakGlobalHandle());
+  CcTest::CollectAllGarbage();
 }