Add perf histogram and tests for inline signin

tools/perf/benchmarks/signin.py

+# Copyright 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.
+
+from measurements import signin
+from telemetry import test
+
+class SigninSingleTab(test.Test):
+  tag = 'navigate'
+  test = signin.SigninMeasurement
+  page_set = 'page_sets/signin.json'
+  options = {'pageset_repeat_iters': 5}
+
+
+class SigninMultiTab(test.Test):
+  tag = 'multitab_navigate'
+  test = signin.SigninMultiTabMeasurement
+  page_set = 'page_sets/signin.json'
+  options = {'pageset_repeat_iters': 10}
+
+
+class SigninStartup(test.Test):
+  # This test runs against the real gaia server, thus should not be used for
+  # benchmarking.
+  tag = 'startup'
+  test = signin.SigninStartUpMeasurement
+  page_set = 'page_sets/blank_page.json'
+  options = {'pageset_repeat_iters': 5}