[telemetry] Try to print browser logs and capture a screenshot upon story failure

telemetry/telemetry/testing/fakes/__init__.py

Index: telemetry/telemetry/testing/fakes/__init__.py
diff --git a/telemetry/telemetry/testing/fakes/__init__.py b/telemetry/telemetry/testing/fakes/__init__.py
index 9e345fcff8b7701dfb2d61fb728979c4a79806cc..1048d39c8fcbc93a50f43de9180284ea3e52ce70 100644
--- a/telemetry/telemetry/testing/fakes/__init__.py
+++ b/telemetry/telemetry/testing/fakes/__init__.py
@@ -253,6 +253,9 @@ class _FakeBrowser(object):
   def tabs(self):
     return self._tabs
 
+  def DumpStateUponFailure(self):
+    pass
+
 
 class _FakeCredentials(object):
   def WarnIfMissingCredentials(self, _):