[heap] Add VMState to IncrementalMarking observer

src/heap/incremental-marking.cc

 // Copyright 2012 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.
 
 #include "src/heap/incremental-marking.h"
 
 #include "src/code-stubs.h"
 #include "src/compilation-cache.h"
 #include "src/conversions.h"
 #include "src/heap/concurrent-marking.h"
 #include "src/heap/gc-idle-time-handler.h"
 #include "src/heap/gc-tracer.h"
 #include "src/heap/heap-inl.h"
 #include "src/heap/mark-compact-inl.h"
 #include "src/heap/object-stats.h"
 #include "src/heap/objects-visiting-inl.h"
 #include "src/heap/objects-visiting.h"
 #include "src/tracing/trace-event.h"
 #include "src/v8.h"
 #include "src/visitors.h"
+#include "src/vm-state-inl.h"
 
 namespace v8 {
 namespace internal {
 
+void IncrementalMarking::Observer::Step(int bytes_allocated, Address, size_t) {
+  VMState<GC> state(incremental_marking_.heap()->isolate());
+  RuntimeCallTimerScope runtime_timer(
+      incremental_marking_.heap()->isolate(),
+      &RuntimeCallStats::GC_IncrementalMarkingObserver);
+  incremental_marking_.AdvanceIncrementalMarkingOnAllocation();
+}
+
 IncrementalMarking::IncrementalMarking(Heap* heap)
     : heap_(heap),
       marking_deque_(nullptr),
       initial_old_generation_size_(0),
       bytes_marked_ahead_of_schedule_(0),
       unscanned_bytes_of_large_object_(0),
       state_(STOPPED),
       idle_marking_delay_counter_(0),
       incremental_marking_finalization_rounds_(0),
       is_compacting_(false),
@@ skipping 1141 matching lines @@
   idle_marking_delay_counter_++;
 }
 
 
 void IncrementalMarking::ClearIdleMarkingDelayCounter() {
   idle_marking_delay_counter_ = 0;
 }
 
 }  // namespace internal
 }  // namespace v8