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 @@
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