Add TRACE_COUNTER support to about:tracing

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

Index: chrome/browser/resources/tracing/tests/simple_trace.json
diff --git a/chrome/browser/resources/tracing/tests/simple_trace.json b/chrome/browser/resources/tracing/tests/simple_trace.json
new file mode 100644
index 0000000000000000000000000000000000000000..e03ced89ca3298bcb55583ef4f87a81102e724ea
--- /dev/null
+++ b/chrome/browser/resources/tracing/tests/simple_trace.json
@@ -0,0 +1,55 @@
+[
+  {"cat": "PERF", "pid": 22630, "tid": 22630, "ts": 826, "ph": "C",
+      "name": "counter", "args": {"value": 10}},
+  {"cat": "PERF", "pid": 22630, "tid": 22630, "ts": 826, "ph": "B",
+      "name": "A long name that doesnt fit but is exceedingly informative", "args": {}},

[James Hawkins, 2011/11/17 05:19:32]

80 cols.

[nduca, 2011/11/18 08:58:19]

Done.

+  {"cat": "PERF", "pid": 22630, "tid": 22630, "ts": 827, "ph": "B",
+      "name": "Asub with a name that wont fit", "args": {}},
+  {"cat": "PERF", "pid": 22630, "tid": 22630, "ts": 828, "ph": "E",
+      "name": "Asub", "args": {}},
+  {"cat": "PERF", "pid": 22630, "tid": 22630, "ts": 829, "ph": "B",
+      "name": "Asub", "args": {}},
+  {"cat": "PERF", "pid": 22630, "tid": 22630, "ts": 832, "ph": "E",
+      "name": "Asub", "args": {}},
+  {"cat": "PERF", "pid": 22630, "tid": 22630, "ts": 832, "ph": "C",
+      "name": "counter", "args": {"value": 1}},
+  {"cat": "PERF", "pid": 22630, "tid": 22630, "ts": 833, "ph": "E",
+      "name": "", "args": {}},
+
+  {"cat": "PERF", "pid": 22630, "tid": 22630, "ts": 835, "ph": "I",
+      "name": "I1", "args": {}},
+  {"cat": "PERF", "pid": 22630, "tid": 22630, "ts": 837, "ph": "I",
+      "name": "I2", "args": {}},
+
+  {"cat": "PERF", "pid": 22630, "tid": 22630, "ts": 839, "ph": "C",
+      "name": "counter", "args": {"value": 5}},
+  {"cat": "PERF", "pid": 22630, "tid": 22630, "ts": 840, "ph": "B",
+      "name": "A not as long a name", "args": {}},
+  {"cat": "PERF", "pid": 22630, "tid": 22630, "ts": 848, "ph": "E",
+      "name": "A not as long a name", "args": {}},
+  {"cat": "PERF", "pid": 22630, "tid": 22630, "ts": 848, "ph": "C",
+      "name": "counter", "args": {"value": 1}},
+  {"cat": "PERF", "pid": 22630, "tid": 22630, "ts": 854, "ph": "C",
+      "name": "counter", "args": {"value": 10}},
+
+  {"cat": "PERF", "pid": 22630, "tid": 22630, "ts": 850, "ph": "B",
+      "name": "B", "args": {}},
+  {"cat": "PERF", "pid": 22630, "tid": 22630, "ts": 854, "ph": "E",
+      "name": "B", "args": {}},
+
+  {"cat": "PERF", "pid": 22630, "tid": 22631, "ts": 827, "ph": "B",
+      "name": "A", "args": {}},
+  {"cat": "PERF", "pid": 22630, "tid": 22631, "ts": 835, "ph": "I",
+      "name": "Immediate Three", "args": {}},
+  {"cat": "PERF", "pid": 22630, "tid": 22631, "ts": 845, "ph": "I",
+      "name": "I4", "args": {}},
+  {"cat": "PERF", "pid": 22630, "tid": 22631, "ts": 854, "ph": "E",
+      "name": "A", "args": {}},
+
+  {"cat": "__metadata", "pid": 22630, "tid": 22630, "ts": 0, "ph": "M",
+      "name": "thread_name", "args": {"name": "threadA"}},
+  {"cat": "__metadata", "pid": 22630, "tid": 22631, "ts": 0, "ph": "M",
+      "name": "thread_name", "args": {"name": "threadB"}},
+  {"cat": "__metadata", "pid": 22630, "tid": 22632, "ts": 0, "ph": "M",
+      "name": "thread_name", "args": {"name": "threadC"}}
+]