trace_event: distinguish between scoped begin/end and global start/finish events

chrome/browser/resources/tracing/tests/start_finish.json

Index: chrome/browser/resources/tracing/tests/start_finish.json
diff --git a/chrome/browser/resources/tracing/tests/start_finish.json b/chrome/browser/resources/tracing/tests/start_finish.json
new file mode 100644
index 0000000000000000000000000000000000000000..0987d9db8bf2306d147acb73c563d9dc27c41636
--- /dev/null
+++ b/chrome/browser/resources/tracing/tests/start_finish.json
@@ -0,0 +1 @@
+[{"cat":"renderer","pid":1,"tid":1,"ts":50,"ph":"S","name":"Long","args":{},"ext","1a"},{"cat":"renderer","pid":1,"tid":1,"ts":100,"ph":"S","name":"Cat","args":{},"ext","1"},{"cat":"renderer","pid":1,"tid":1,"ts":120,"ph":"B","name":"Scoped","args":{}},{"cat":"renderer","pid":1,"tid":1,"ts":150,"ph":"F","name":"Mismatch","args":{},"ext","beef1"},{"cat":"renderer","pid":1,"tid":1,"ts":170,"ph":"E","name":"Scoped","args":{}},{"cat":"renderer","pid":1,"tid":1,"ts":200,"ph":"S","name":"Cat","args":{},"ext","2"},{"cat":"renderer","pid":1,"tid":1,"ts":220,"ph":"B","name":"Scoped","args":{}},{"cat":"renderer","pid":1,"tid":1,"ts":230,"ph":"B","name":"SubScoped","args":{}},{"cat":"renderer","pid":1,"tid":1,"ts":250,"ph":"S","name":"Long","args":{},"ext","2a"},{"cat":"renderer","pid":1,"tid":1,"ts":270,"ph":"E","name":"SubScoped","args":{}},{"cat":"renderer","pid":1,"tid":1,"ts":300,"ph":"F","name":"Cat","args":{},"ext","1"},{"cat":"renderer","pid":1,"tid":1,"ts":350,"ph":"E","name":"Scoped","args":{}},{"cat":"renderer","pid":1,"tid":1,"ts":400,"ph":"F","name":"Cat","args":{},"ext","2"},{"cat":"renderer","pid":2,"tid":2,"ts":500,"ph":"S","name":"Dog","args":{},"ext","1"},{"cat":"renderer","pid":2,"tid":3,"ts":600,"ph":"S","name":"Dog","args":{},"ext","2"},{"cat":"renderer","pid":3,"tid":4,"ts":700,"ph":"F","name":"Dog","args":{},"ext","1"},{"cat":"renderer","pid":1,"tid":1,"ts":725,"ph":"S","name":"Mismatch","args":{},"ext","beef2"},{"cat":"renderer","pid":1,"tid":1,"ts":750,"ph":"F","name":"Long","args":{},"ext","2a"},{"cat":"renderer","pid":3,"tid":5,"ts":800,"ph":"F","name":"Dog","args":{},"ext","2"},{"cat":"renderer","pid":1,"tid":1,"ts":900,"ph":"F","name":"Long","args":{},"ext","1a"}]

[nduca, 2011/12/01 02:55:26]

80cols, follow style of simple_trace.json

Are both mangled-pointers and regular IDs in here?

[jbates, 2011/12/01 23:07:50]

Done.
They both become hex IDs, so no difference here.