Memory reducer should use the current allocation rate instead of the overall allocation rate.

src/heap/memory-reducer.cc

Index: src/heap/memory-reducer.cc
diff --git a/src/heap/memory-reducer.cc b/src/heap/memory-reducer.cc
index 7063fc4b2eb5c549ad6c1ba26e350461a4c824da..252b9737253acc7d62ff1d58ab39120a664cda5d 100644
--- a/src/heap/memory-reducer.cc
+++ b/src/heap/memory-reducer.cc
@@ -24,9 +24,12 @@ MemoryReducer::TimerTask::TimerTask(MemoryReducer* memory_reducer)
 
 void MemoryReducer::TimerTask::RunInternal() {
   Heap* heap = memory_reducer_->heap();
+  double time_ms = heap->MonotonicallyIncreasingTimeInMs();
+  heap->tracer()->SampleAllocation(time_ms, heap->NewSpaceAllocationCounter(),
+                                   heap->OldGenerationAllocationCounter());
   Event event;
   event.type = kTimer;
-  event.time_ms = heap->MonotonicallyIncreasingTimeInMs();
+  event.time_ms = time_ms;
   event.low_allocation_rate = heap->HasLowAllocationRate();
   event.can_start_incremental_gc =
       heap->incremental_marking()->IsStopped() &&