[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 3e5e6c0697cd505bf49880d407891ef8f938458a..e900d26d156dcef83a3e659033d1194d88b7e00b 100644
--- a/src/heap/incremental-marking.cc
+++ b/src/heap/incremental-marking.cc
@@ -546,6 +546,12 @@ static void PatchIncrementalMarkingRecordWriteStubs(
 }
 
 
+static void IncrementalMarkingStepCallback(int bytes_allocated, void* arg) {
+  auto im = static_cast<IncrementalMarking*>(arg);
+  im->Step(bytes_allocated, IncrementalMarking::GC_VIA_STACK_GUARD);
+}
+
+
 void IncrementalMarking::Start(const char* reason) {
   if (FLAG_trace_incremental_marking) {
     PrintF("[IncrementalMarking] Start (%s)\n",
@@ -569,7 +575,9 @@ void IncrementalMarking::Start(const char* reason) {
     state_ = SWEEPING;
   }
 
-  heap_->LowerInlineAllocationLimit(kAllocatedThreshold);
+  heap_->new_space()->AddInlineAllocationObserver(
+      kAllocatedThreshold, IncrementalMarkingStepCallback, this);
+
   incremental_marking_job()->Start(heap_);
 }
 
@@ -821,7 +829,9 @@ void IncrementalMarking::Stop() {
   if (FLAG_trace_incremental_marking) {
     PrintF("[IncrementalMarking] Stopping.\n");
   }
-  heap_->ResetInlineAllocationLimit();
+  heap_->new_space()->RemoveInlineAllocationObserver(
+      IncrementalMarkingStepCallback);
+
   IncrementalMarking::set_should_hurry(false);
   ResetStepCounters();
   if (IsMarking()) {
@@ -849,7 +859,8 @@ void IncrementalMarking::Finalize() {
   Hurry();
   state_ = STOPPED;
   is_compacting_ = false;
-  heap_->ResetInlineAllocationLimit();
+  heap_->new_space()->RemoveInlineAllocationObserver(
+      IncrementalMarkingStepCallback);
   IncrementalMarking::set_should_hurry(false);
   ResetStepCounters();
   PatchIncrementalMarkingRecordWriteStubs(heap_,