Record Chrome trace events in tcmalloc heap profiles

third_party/tcmalloc/chromium/src/heap-profile-table.h

Index: third_party/tcmalloc/chromium/src/heap-profile-table.h
diff --git a/third_party/tcmalloc/chromium/src/heap-profile-table.h b/third_party/tcmalloc/chromium/src/heap-profile-table.h
index c2ad39f9138f4049fc9de2e45a385a8e1819e687..139c1110a39aa1c42e1b179f73b7ec35c2ff93a2 100644
--- a/third_party/tcmalloc/chromium/src/heap-profile-table.h
+++ b/third_party/tcmalloc/chromium/src/heap-profile-table.h
@@ -184,6 +184,11 @@ class HeapProfileTable {
   // We do not provision for 0-terminating 'buf'.
   int FillOrderedProfile(char buf[], int size) const;
 
+  // Fill pseudo-stack profile data into buffer 'buf' of size 'size' and
+  // return the actual size occupied by the dump in 'buf'. The output is
+  // JSON formatted. 'buf' will not be zero-terminated.
+  int FillPseudoStackProfile(char buf[], int size) const;
+
   // Cleanup any old profile files matching prefix + ".*" + kFileExt.
   static void CleanupOldProfiles(const char* prefix);
 
@@ -368,6 +373,15 @@ class HeapProfileTable {
                            const char* extra,
                            Stats* profile_stats);
 
+  // Unparse bucket b and print its portion of profile dump into buf.
+  // We return the amount of space in buf that we use.  We start printing
+  // at buf + buflen, and promise not to go beyond buf + bufsize.
+  // We do not provision for 0-terminating 'buf'. Output is in JSON format.
+  static int UnparsePseudoStackBucket(
+      const Bucket& b,
+      char* buf, int buflen, int bufsize,
+      Stats* profile_stats);
+
   // Get the bucket for the caller stack trace 'key' of depth 'depth'
   // creating the bucket if needed.
   Bucket* GetBucket(int depth, const void* const key[]);