Smoke test for tracing infrastructure in PyAuto

chrome/test/functional/tracing/timeline_model.py

Index: chrome/test/functional/tracing/timeline_model.py
diff --git a/chrome/test/functional/tracing/timeline_model.py b/chrome/test/functional/tracing/timeline_model.py
new file mode 100644
index 0000000000000000000000000000000000000000..9fb069600b46300368ef495ffd51848ace07a3fa
--- /dev/null
+++ b/chrome/test/functional/tracing/timeline_model.py
@@ -0,0 +1,58 @@
+# Copyright (c) 2011 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import json
+import os
+
+def escape_for_quoted_javascript_execution(js):
+    # Poor man's string escape.
+    return js.replace("'", "\\'");
+
+class TimelineModelProxy:
+  def __init__(self, js_executor, shim_id):
+    self._js_executor = js_executor
+    self._shim_id = shim_id
+
+  # Warning: The JSON serialization process removes cyclic references.
+  # TODO(eatnumber) regenerate these cyclic references on deserialization.
+  def _callModelMethod(self, method_name, *args):
+    result = self._js_executor(
+      """
+        window.timelineModelShims['%s'].invokeMethod('%s', '%s')
+      """ % (
+        self._shim_id,
+        escape_for_quoted_javascript_execution(method_name),
+        escape_for_quoted_javascript_execution(json.dumps(args))
+      )
+    )
+    if result["success"]:
+      return result["data"]
+    # TODO(eatnumber) Make these exceptions more reader friendly.
+    raise Exception(result)
+
+  def __del__(self):
+    self._js_executor(
+      """
+        window.timelineModelShims['%s'] = undefined;
+        window.domAutomationController.send('');
+      """ % self._shim_id
+    )
+
+  def getAllThreads(self):
+    return self._callModelMethod("getAllThreads")
+
+  def getAllCpus(self):
+    return self._callModelMethod("getAllCpus")
+
+  def getAllProcesses(self):
+    return self._callModelMethod("getAllProcesses")
+
+  def getAllCounters(self):
+    return self._callModelMethod("getAllCounters")
+
+  def findAllThreadsNamed(self, name):
+    return self._callModelMethod("findAllThreadsNamed", name);
+
+# Alias TimelineModel to TimelineModelProxy for convenience.
+TimelineModel = TimelineModelProxy