[tracing] Adding task information to heap profiler

base/trace_event/common/trace_event_common.h

Index: base/trace_event/common/trace_event_common.h
diff --git a/base/trace_event/common/trace_event_common.h b/base/trace_event/common/trace_event_common.h
index f65b35bcc46e632150ed81260da87e92ae7ac23e..0b549d43d70799884c33499d64a67e5a0aa22d0f 100644
--- a/base/trace_event/common/trace_event_common.h
+++ b/base/trace_event/common/trace_event_common.h
@@ -926,6 +926,15 @@
                                    name, id, TRACE_EVENT_FLAG_COPY, arg1_name, \
                                    arg1_val, arg2_name, arg2_val)
 
+// Special trace event macro to trace task execution with the location where it
+// was posted from.
+#define TRACE_TASK_EXECUTION(run_function, task)                        \
+  TRACE_EVENT2("toplevel", run_function, "src_file",                    \
+               (task).posted_from.file_name(), "src_func",              \
+               (task).posted_from.function_name());                     \
+  TRACE_EVENT_API_SCOPED_TASK_EXECUTION_EVENT INTERNAL_TRACE_EVENT_UID( \
+      task_event)((task).posted_from.file_name());
+
 // TRACE_EVENT_METADATA* events are information related to other
 // injected events, not events in their own right.
 #define TRACE_EVENT_METADATA1(category_group, name, arg1_name, arg1_val) \