Get a filename of dumped heap profile in a V8 extension HeapProfilerDump().

third_party/tcmalloc/chromium/src/gperftools/heap-profiler.h

Index: third_party/tcmalloc/chromium/src/gperftools/heap-profiler.h
diff --git a/third_party/tcmalloc/chromium/src/gperftools/heap-profiler.h b/third_party/tcmalloc/chromium/src/gperftools/heap-profiler.h
index 8e3ee962c7126c9f582c022033b95cd71953902e..a2fe805e9199e3193bb809334ad9f5ee92d9bd6d 100644
--- a/third_party/tcmalloc/chromium/src/gperftools/heap-profiler.h
+++ b/third_party/tcmalloc/chromium/src/gperftools/heap-profiler.h
@@ -90,6 +90,15 @@ PERFTOOLS_DLL_DECL void HeapProfilerStop();
  */
 PERFTOOLS_DLL_DECL void HeapProfilerDump(const char *reason);
 
+/* Dump a profile to a file now and store the dumped filename to
+ * "dumped_filename_buffer" which has a length of "filename_buffer_length"
+ * in addition to HeapProfilerDump().
+ */
+PERFTOOLS_DLL_DECL void HeapProfilerDumpWithFileName(
+    const char *reason,
+    char* dumped_filename_buffer,
+    int filename_buffer_length);
+
 /* Generate current heap profiling information.
  * Returns an empty string when heap profiling is not active.
  * The returned pointer is a '\0'-terminated string allocated using malloc()