Heap profiler: count the number of back references for objects.

src/log-utils.h

Index: src/log-utils.h
diff --git a/src/log-utils.h b/src/log-utils.h
index ad669d53d76360bbf63874334734fb8149bf5d97..117f098cc8eed9b4b53c55b1f3810590acdaa597 100644
--- a/src/log-utils.h
+++ b/src/log-utils.h
@@ -114,6 +114,9 @@ class Log : public AllStatic {
     return !is_stopped_ && (output_handle_ != NULL || output_buffer_ != NULL);
   }
 
+  // Size of buffer used for formatting log messages.
+  static const int kMessageBufferSize = 2048;
+
  private:
   typedef int (*WritePtr)(const char* msg, int length);
 
@@ -162,9 +165,6 @@ class Log : public AllStatic {
   // access to the formatting buffer and the log file or log memory buffer.
   static Mutex* mutex_;
 
-  // Size of buffer used for formatting log messages.
-  static const int kMessageBufferSize = 2048;
-
   // Buffer used for formatting log messages. This is a singleton buffer and
   // mutex_ should be acquired before using it.
   static char* message_buffer_;
@@ -247,6 +247,9 @@ class LogMessageBuilder BASE_EMBEDDED {
 
   void AppendDetailed(String* str, bool show_impl_info);
 
+  // Append a portion of a string.
+  void AppendStringPart(const char* str, int len);
+
   // Stores log message into compressor, returns true if the message
   // was stored (i.e. doesn't repeat the previous one).
   bool StoreInCompressor(LogRecordCompressor* compressor);