Use an idle notification of 0ms as hint that a GC after context disposal is triggerd

test/unittests/heap/gc-idle-time-handler-unittest.cc

Index: test/unittests/heap/gc-idle-time-handler-unittest.cc
diff --git a/test/unittests/heap/gc-idle-time-handler-unittest.cc b/test/unittests/heap/gc-idle-time-handler-unittest.cc
index 6bf04cdc400bf8e98e9aa0f9edc93d25d20d0f40..55dd6c6f58253daf207799de9dfe66561c5ef603 100644
--- a/test/unittests/heap/gc-idle-time-handler-unittest.cc
+++ b/test/unittests/heap/gc-idle-time-handler-unittest.cc
@@ -191,6 +191,17 @@ TEST_F(GCIdleTimeHandlerTest, AfterContextDisposeLargeIdleTime) {
 }
 
 
+TEST_F(GCIdleTimeHandlerTest, AfterContextDisposeZeroIdleTime) {
+  GCIdleTimeHandler::HeapState heap_state = DefaultHeapState();
+  heap_state.contexts_disposed = 1;
+  heap_state.incremental_marking_stopped = true;
+  heap_state.size_of_objects = GCIdleTimeHandler::kSmallHeapSize / 2;
+  int idle_time_ms = 0;
+  GCIdleTimeAction action = handler()->Compute(idle_time_ms, heap_state);
+  EXPECT_EQ(DO_FULL_GC, action.type);
+}
+
+
 TEST_F(GCIdleTimeHandlerTest, AfterContextDisposeSmallIdleTime1) {
   GCIdleTimeHandler::HeapState heap_state = DefaultHeapState();
   heap_state.contexts_disposed = 1;