Add TRACE_COUNTER support to about:tracing

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

Index: chrome/browser/resources/tracing/tests/nonnested_trace.json
diff --git a/chrome/browser/resources/tracing/tests/nonnested_trace.json b/chrome/browser/resources/tracing/tests/nonnested_trace.json
new file mode 100644
index 0000000000000000000000000000000000000000..f4bcc9e43edd20ca50d6b24cd966cd70b6e5a8a7
--- /dev/null
+++ b/chrome/browser/resources/tracing/tests/nonnested_trace.json
@@ -0,0 +1,23 @@
+[
+        {"cat": "PERF", "pid": 22630, "tid": 22630, "ts": 826, "ph": "B",

[James Hawkins, 2011/11/16 17:41:38]

I'm not sure if we have a style for JSON per se, but if anything, it should
match our JS style.  That means 2 space indentation for blocks and 4 space
indentation for line wraps.

[nduca, 2011/11/16 19:03:56]

Done.

+          "name": "A", "args": {}},
+        {"cat": "PERF", "pid": 22630, "tid": 22630, "ts": 827, "ph": "B",
+          "name": "Asub", "args": {}},
+        {"cat": "PERF", "pid": 22630, "tid": 22630, "ts": 829, "ph": "B",
+          "name": "NonNest", "args": {"id": "1", "ui-nest": "0"}},
+        {"cat": "PERF", "pid": 22630, "tid": 22630, "ts": 830, "ph": "B",
+          "name": "NonNest", "args": {"id": "2", "ui-nest": "0"}},
+        {"cat": "PERF", "pid": 22630, "tid": 22630, "ts": 831, "ph": "E",
+          "name": "Asub", "args": {}},
+        {"cat": "PERF", "pid": 22630, "tid": 22630, "ts": 832, "ph": "E",
+          "name": "NonNest", "args": {"id": "1", "ui-nest": "0"}},
+        {"cat": "PERF", "pid": 22630, "tid": 22630, "ts": 833, "ph": "E",
+          "name": "NonNest", "args": {"id": "2", "ui-nest": "0"}},
+        {"cat": "PERF", "pid": 22630, "tid": 22630, "ts": 834, "ph": "E",
+          "name": "A", "args": {}},
+
+        {"cat": "PERF", "pid": 22630, "tid": 22631, "ts": 827, "ph": "B",
+          "name": "A", "args": {}},
+        {"cat": "PERF", "pid": 22630, "tid": 22631, "ts": 854, "ph": "E",
+          "name": "A", "args": {}}
+      ]

[James Hawkins, 2011/11/16 17:41:38]

Indentation off here.

[nduca, 2011/11/16 19:03:56]

Done.