Record Chrome trace events in tcmalloc heap profiles

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..ef23d7c8ba0469584b6f817e51760b9ab56ee74e 100644
--- a/third_party/tcmalloc/chromium/src/gperftools/heap-profiler.h
+++ b/third_party/tcmalloc/chromium/src/gperftools/heap-profiler.h
@@ -109,6 +109,14 @@ typedef void (*AddressVisitor)(void* data, const void* ptr);
 PERFTOOLS_DLL_DECL void IterateAllocatedObjects(AddressVisitor callback,
                                                 void* data);
 
+/* Sets a callback function to return a pseudo-stack for application-generated
+ * stacks during heap profiling. The caller must provide a buffer in |stack|
+ * of at least size 32 * sizeof(void*). Returns the number of items copied or
+ * zero.
+ */
+typedef int (*PseudoStackGenerator)(void** stack);
+PERFTOOLS_DLL_DECL void SetPseudoStackGenerator(PseudoStackGenerator callback);
+
 #ifdef __cplusplus
 }  // extern "C"
 #endif