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..68573093a0760b696d249cdc3d626da17e122d3e
--- /dev/null
+++ b/chrome/test/functional/tracing/timeline_model.py
@@ -0,0 +1,57 @@
+# Copyright (c) 2012 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
+
+
+class TimelineModel(object):
+  """A proxy for about:tracing's TimelineModel class.
+
+  Test authors should never need to know that this class is a proxy.
+  """
+  @staticmethod
+  def _EscapeForQuotedJavascriptExecution(js):
+      # Poor man's string escape.
+      return js.replace('\'', '\\\'');
+
+  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,
+            self._EscapeForQuotedJavascriptExecution(method_name),
+            self._EscapeForQuotedJavascriptExecution(json.dumps(args))
+        )
+    )
+    if result['success']:
+      return result['data']
+    # TODO(eatnumber): Make these exceptions more reader friendly.
+    raise RuntimeError(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);