[heap] inline allocation steps refactor

src/heap/incremental-marking.cc

Index: src/heap/incremental-marking.cc
diff --git a/src/heap/incremental-marking.cc b/src/heap/incremental-marking.cc
index 6d759253dff79dfa6362d97af8547ce733de1b5b..cdd08e83102035d52c972515148ec4f85093efa1 100644
--- a/src/heap/incremental-marking.cc
+++ b/src/heap/incremental-marking.cc
@@ -17,7 +17,6 @@
 namespace v8 {
 namespace internal {
 
-
 IncrementalMarking::StepActions IncrementalMarking::IdleStepActions() {
   return StepActions(IncrementalMarking::NO_GC_VIA_STACK_GUARD,
                      IncrementalMarking::FORCE_MARKING,
@@ -27,6 +26,7 @@ IncrementalMarking::StepActions IncrementalMarking::IdleStepActions() {
 
 IncrementalMarking::IncrementalMarking(Heap* heap)
     : heap_(heap),
+      observer_(*this, kAllocatedThreshold),
       state_(STOPPED),
       is_compacting_(false),
       steps_count_(0),
@@ -571,7 +571,8 @@ void IncrementalMarking::Start(const char* reason) {
     state_ = SWEEPING;
   }
 
-  heap_->LowerInlineAllocationLimit(kAllocatedThreshold);
+  heap_->new_space()->AddInlineAllocationObserver(&observer_);
+
   incremental_marking_job()->Start(heap_);
 }
 
@@ -846,7 +847,8 @@ void IncrementalMarking::Stop() {
   if (FLAG_trace_incremental_marking) {
     PrintF("[IncrementalMarking] Stopping.\n");
   }
-  heap_->ResetInlineAllocationLimit();
+
+  heap_->new_space()->RemoveInlineAllocationObserver(&observer_);
   IncrementalMarking::set_should_hurry(false);
   ResetStepCounters();
   if (IsMarking()) {
@@ -874,7 +876,8 @@ void IncrementalMarking::Finalize() {
   Hurry();
   state_ = STOPPED;
   is_compacting_ = false;
-  heap_->ResetInlineAllocationLimit();
+
+  heap_->new_space()->RemoveInlineAllocationObserver(&observer_);
   IncrementalMarking::set_should_hurry(false);
   ResetStepCounters();
   PatchIncrementalMarkingRecordWriteStubs(heap_,