[heap] Add basic infrastructure for Minor Mark-Compact collector

src/heap/gc-tracer.h

 // Copyright 2014 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_GC_TRACER_H_
 #define V8_HEAP_GC_TRACER_H_
 
 #include "src/base/compiler-specific.h"
 #include "src/base/platform/platform.h"
 #include "src/base/ring-buffer.h"
@@ skipping 134 matching lines @@
     DISALLOW_COPY_AND_ASSIGN(Scope);
   };
 
 
   class Event {
    public:
     enum Type {
       SCAVENGER = 0,
       MARK_COMPACTOR = 1,
       INCREMENTAL_MARK_COMPACTOR = 2,
-      START = 3
+      MINOR_MARK_COMPACTOR = 3,
+      START = 4
     };
 
     Event(Type type, GarbageCollectionReason gc_reason,
           const char* collector_reason);
 
     // Returns a string describing the event type.
     const char* TypeName(bool short_name) const;
 
     // Type of event
     Type type;
@@ skipping 256 matching lines @@
   base::RingBuffer<BytesAndDuration> recorded_old_generation_allocations_;
   base::RingBuffer<double> recorded_context_disposal_times_;
   base::RingBuffer<double> recorded_survival_ratios_;
 
   DISALLOW_COPY_AND_ASSIGN(GCTracer);
 };
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_HEAP_GC_TRACER_H_