Make incremental marking tracing format consistent with GC tracing.

src/heap/incremental-marking.h

 // 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.
 
 #ifndef V8_HEAP_INCREMENTAL_MARKING_H_
 #define V8_HEAP_INCREMENTAL_MARKING_H_
 
 #include "src/cancelable-task.h"
 #include "src/execution.h"
 #include "src/heap/heap.h"
@@ skipping 128 matching lines @@
   static const size_t kMaxIdleMarkingDelayCounter = 3;
 
   void FinalizeSweeping();
 
   void OldSpaceStep(intptr_t allocated);
 
   intptr_t Step(intptr_t allocated, CompletionAction action,
                 ForceMarkingAction marking = DO_NOT_FORCE_MARKING,
                 ForceCompletionAction completion = FORCE_COMPLETION);
 
-  inline void RestartIfNotMarking() {
-    if (state_ == COMPLETE) {
-      state_ = MARKING;
-      if (FLAG_trace_incremental_marking) {
-        PrintF("[IncrementalMarking] Restarting (new grey objects)\n");
-      }
-    }
-  }
+  inline void RestartIfNotMarking();
 
   static void RecordWriteFromCode(HeapObject* obj, Object** slot,
                                   Isolate* isolate);
 
   static void RecordWriteOfCodeEntryFromCode(JSFunction* host, Object** slot,
                                              Isolate* isolate);
 
   // Record a slot for compaction.  Returns false for objects that are
   // guaranteed to be rescanned or not guaranteed to survive.
   //
@@ skipping 165 matching lines @@
   GCRequestType request_type_;
 
   IncrementalMarkingJob incremental_marking_job_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(IncrementalMarking);
 };
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_HEAP_INCREMENTAL_MARKING_H_