Replace reduce-memory mode in idle notification with delayed clean-up GC.

test/cctest/test-api.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 15345 matching lines @@
   v8::HandleScope scope(CcTest::isolate());
   i::AlwaysAllocateScope always_allocate(CcTest::i_isolate());
   for (int i = 0; i < 1000; i++) {
     factory->NewFixedArray(1000, i::TENURED);
   }
 }
 
 
 // Test that idle notification can be handled and eventually collects garbage.
 TEST(TestIdleNotification) {
+  if (!i::FLAG_incremental_marking) return;
   const intptr_t MB = 1024 * 1024;
   const double IdlePauseInSeconds = 1.0;
   LocalContext env;
   v8::HandleScope scope(env->GetIsolate());
   intptr_t initial_size = CcTest::heap()->SizeOfObjects();
   CreateGarbageInOldSpace();
   intptr_t size_with_garbage = CcTest::heap()->SizeOfObjects();
   CHECK_GT(size_with_garbage, initial_size + MB);
   bool finished = false;
   for (int i = 0; i < 200 && !finished; i++) {
+    if (i < 10 && CcTest::heap()->incremental_marking()->IsStopped()) {
+      CcTest::heap()->StartIdleIncrementalMarking();
+    }
     finished = env->GetIsolate()->IdleNotificationDeadline(
         (v8::base::TimeTicks::HighResolutionNow().ToInternalValue() /
          static_cast<double>(v8::base::Time::kMicrosecondsPerSecond)) +
         IdlePauseInSeconds);
   }
   intptr_t final_size = CcTest::heap()->SizeOfObjects();
   CHECK(finished);
   CHECK_LT(final_size, initial_size + 1);
 }
 
@@ skipping 6274 matching lines @@
   CHECK(set->Has(env.local(), set).FromJust());
 
   CHECK(set->Delete(env.local(), set).FromJust());
   CHECK_EQ(2U, set->Size());
   CHECK(!set->Has(env.local(), set).FromJust());
   CHECK(!set->Delete(env.local(), set).FromJust());
 
   set->Clear();
   CHECK_EQ(0U, set->Size());
 }