Add the rate of js invocations from the api as a signal of idleness

test/cctest/heap-tester.h

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef HEAP_TESTER_H_
 #define HEAP_TESTER_H_
 
 #include "src/handles.h"
 #include "src/heap/spaces.h"
 
 // Tests that should have access to private methods of {v8::internal::Heap}.
 // Those tests need to be defined using HEAP_TEST(Name) { ... }.
 #define HEAP_TEST_METHODS(V)            \
   V(CompactionSpaceDivideMultiplePages) \
   V(CompactionSpaceDivideSinglePage)    \
   V(GCFlags)                            \
   V(MarkCompactCollector)               \
   V(NoPromotion)                        \
   V(NumberStringCacheSize)              \
   V(ObjectGroups)                       \
   V(Promotion)                          \
   V(Regression39128)                    \
   V(ResetWeakHandle)                    \
   V(StressHandles)                      \
+  V(TestMemoryReducerSampleJsCalls)     \
   V(TestSizeOfObjects)                  \
   V(WriteBarriersInCopyJSObject)
 
 
 #define HEAP_TEST(Name)                                                       \
   CcTest register_test_##Name(v8::internal::HeapTester::Test##Name, __FILE__, \
                               #Name, NULL, true, true);                       \
   void v8::internal::HeapTester::Test##Name()
 
 
@@ skipping 37 matching lines @@
   static void TestCompactionSpaceDivide(int num_additional_objects,
                                         int object_size,
                                         int num_compaction_spaces,
                                         int additional_capacity_in_bytes);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // HEAP_TESTER_H_