Added support to listen on Network.responseReceived and expose that through tab.py

tools/telemetry/telemetry/core/backends/chrome/timeline_recorder.py

Index: tools/telemetry/telemetry/core/backends/chrome/timeline_recorder.py
diff --git a/tools/telemetry/telemetry/core/backends/chrome/timeline_recorder.py b/tools/telemetry/telemetry/core/backends/chrome/timeline_recorder.py
new file mode 100644
index 0000000000000000000000000000000000000000..8935136351a52b26204a9a559afc7807fd2616e3
--- /dev/null
+++ b/tools/telemetry/telemetry/core/backends/chrome/timeline_recorder.py
@@ -0,0 +1,21 @@
+# Copyright (c) 2014 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.
+
+class TimelineRecorder(object):

[tonyg, 2014/03/04 05:27:31]

How is this different from an Importer?

[bolian, 2014/03/04 20:32:44]

Sorry, the class doc was wrong and confusing. The TimelineRecorder will recorded
raw events and return them in Stop(), which will be imported by an Importer.
On 2014/03/04 05:27:31, tonyg wrote:

+  """Interface for classes that can add events to
+  a timeline model from raw event data."""
+  def __init__(self):
+    self._timeline_model = None
+
+  @property
+  def timeline_model(self):
+    return self._timeline_model
+
+  def Start(self):
+    """Starts recording."""
+    raise NotImplementedError
+
+  def Stop(self, timeline_model):
+    """Stops recording and makes a TimelineModel with the event data."""
+    raise NotImplementedError