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..c9053ba71cee68719ff123de3ea5a485e93e8813
--- /dev/null
+++ b/chrome/browser/resources/tracing/tests/start_finish.json
@@ -0,0 +1,22 @@
+[
+{"cat":"r","pid":1,"tid":1,"ts":50,"ph":"S","name":"A","args":{},"id":"1a"},
+{"cat":"r","pid":1,"tid":1,"ts":100,"ph":"S","name":"B","args":{},"id":"1"},
+{"cat":"r","pid":1,"tid":1,"ts":120,"ph":"B","name":"BE1","args":{}},
+{"cat":"r","pid":1,"tid":1,"ts":150,"ph":"F","name":"D","args":{},"id":"bf1"},
+{"cat":"r","pid":1,"tid":1,"ts":170,"ph":"E","name":"BE1","args":{}},
+{"cat":"r","pid":1,"tid":1,"ts":200,"ph":"S","name":"B","args":{},"id":"2"},
+{"cat":"r","pid":1,"tid":1,"ts":220,"ph":"B","name":"BE1","args":{}},
+{"cat":"r","pid":1,"tid":1,"ts":230,"ph":"B","name":"BE2","args":{}},
+{"cat":"r","pid":1,"tid":1,"ts":250,"ph":"S","name":"A","args":{},"id":"2a"},
+{"cat":"r","pid":1,"tid":1,"ts":270,"ph":"E","name":"BE2","args":{}},
+{"cat":"r","pid":1,"tid":1,"ts":300,"ph":"F","name":"B","args":{},"id":"1"},
+{"cat":"r","pid":1,"tid":1,"ts":350,"ph":"E","name":"BE1","args":{}},
+{"cat":"r","pid":1,"tid":1,"ts":400,"ph":"F","name":"B","args":{},"id":"2"},
+{"cat":"r","pid":2,"tid":2,"ts":500,"ph":"S","name":"E","args":{},"id":"1"},
+{"cat":"r","pid":2,"tid":3,"ts":600,"ph":"S","name":"E","args":{},"id":"2"},
+{"cat":"r","pid":3,"tid":4,"ts":700,"ph":"F","name":"E","args":{},"id":"1"},
+{"cat":"r","pid":1,"tid":1,"ts":725,"ph":"S","name":"D","args":{},"id":"bf2"},
+{"cat":"r","pid":1,"tid":1,"ts":750,"ph":"F","name":"A","args":{},"id":"2a"},
+{"cat":"r","pid":3,"tid":5,"ts":800,"ph":"F","name":"E","args":{},"id":"2"},
+{"cat":"r","pid":1,"tid":1,"ts":900,"ph":"F","name":"A","args":{},"id":"1a"}

[jar (doing other things), 2011/12/02 00:09:32]

+1  This is MUCH nicer ;-)

+]