Add perf histogram and tests for inline signin

tools/perf/measurements/signin.py

Index: tools/perf/measurements/signin.py
diff --git a/tools/perf/measurements/signin.py b/tools/perf/measurements/signin.py
new file mode 100644
index 0000000000000000000000000000000000000000..f27342d28db5f5798b3fc2f40bebf551a4530fc6
--- /dev/null
+++ b/tools/perf/measurements/signin.py
@@ -0,0 +1,71 @@
+# 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.
+
+import json
+
+from metrics import histogram_util
+from telemetry.page import page_measurement
+
+class SigninMeasurement(page_measurement.PageMeasurement):
+  HISTOGRAMS_SUFFIXES = ['PreGaiaLoadTime', 'GaiaLoadTime']
+
+  def __init__(self, restart_after_each_run = True):
+    super(SigninMeasurement, self).__init__(
+        needs_browser_restart_after_each_run=restart_after_each_run)
+    self._close_tabs_before_run = False
+    self._use_same_tab = True
+    self._pageset_repeat_iters = 0
+    self._trace_name = 'InlineUI_LoadAfterStartupDuration'
+    self._histogram_prefix = 'Signin.InlineUI.LoadAfterStartup.'
+
+  def CustomizeBrowserOptions(self, options):
+    options.AppendExtraBrowserArgs('--enable-stats-collection-bindings')
+    self._pageset_repeat_iters = options.pageset_repeat_iters
+
+  def TabForPage(self, page, browser):
+    return browser.tabs[0] if self._use_same_tab else browser.tabs.New()
+
+  def MeasurePage(self, page, tab, results):
+    total_num_tabs = 1 if self._use_same_tab else \
+        len(page.page_set.pages) * self._pageset_repeat_iters + 1
+    if len(tab.browser.tabs) != total_num_tabs:
+      return
+
+    tab.WaitForJavaScriptExpression('window.__login_ui_initialized', 5000)
+
+    for suffix in self.HISTOGRAMS_SUFFIXES:
+      load_histogram = json.loads(histogram_util.GetHistogram(
+          histogram_util.BROWSER_HISTOGRAM,
+          self._histogram_prefix + suffix, tab))
+      load_histogram_count = load_histogram['count'] \
+          if 'count' in load_histogram else 0
+      expected_histogram_count = 1 if self._use_same_tab else total_num_tabs -1
+      if load_histogram_count != expected_histogram_count:
+        raise Exception(
+            'Unexpected number of histograms, expected:%d, actual:%d'
+            % (expected_histogram_count, load_histogram_count))
+
+      results.Add(self._trace_name + '_' + suffix, 'ms',
+          load_histogram['sum'] / load_histogram_count)
+
+
+class SigninMultiTabMeasurement(SigninMeasurement):
+  def __init__(self):
+    super(SigninMultiTabMeasurement, self).__init__(
+        restart_after_each_run=False)
+    self._use_same_tab = False
+
+
+class SigninStartUpMeasurement(SigninMeasurement):
+  def __init__(self):
+    super(SigninStartUpMeasurement, self).__init__()
+    self._trace_name = 'InlineUI_LoadOnStartupDuration'
+    self._histogram_prefix = 'Signin.InlineUI.LoadOnStartup.'
+
+  def CustomizeBrowserOptions(self, options):
+    super(SigninStartUpMeasurement, self).CustomizeBrowserOptions(options)
+    options.AppendExtraBrowserArgs('--force-signin-promo')
+
+  def RunNavigateSteps(self, page, tab):
+    pass