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..164aa32fc15202bd751d3de17b5b9d86dfe9bd43 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 'buffer'.
+  // We return the amount of space in 'buffer' that we use.  We start printing
+  // at buffer + written, and promise not to go beyond buffer + buffer_size.
+  // We do not provision for 0-terminating 'buf'. Output is in JSON format.
+  static int UnparsePseudoStackBucket(
+      const Bucket& b,
+      char* buffer, int written, int buffer_size,
+      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[]);