Add telemetry test for paper calculator hit testing performance.

tools/perf/page_sets/key_hit_test_cases.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 telemetry.page import page as page_module
+from telemetry.page import page_set as page_set_module
+
+
+class KeyHitTestCasesPage(page_module.Page):
+
+  def __init__(self, url, page_set):
+    super(KeyHitTestCasesPage, self).__init__(
+        url=url, page_set=page_set, credentials_path = 'data/credentials.json')
+    self.user_agent_type = 'mobile'
+
+  def RunNavigateSteps(self, action_runner):
+    action_runner.NavigateToPage(self)
+    action_runner.Wait(2)
+
+  def RunSmoothness(self, action_runner):

[Yufeng Shen (Slow to review), 2014/12/10 20:17:39]

we probably don't need this. No page in this pageset would ever
want a default scroll action right ? 

[Zeeshan Qureshi, 2014/12/10 20:36:24]

Done.

+    interaction = action_runner.BeginGestureInteraction(
+        'ScrollAction', is_smooth=True)
+    action_runner.ScrollPage()
+    interaction.End()
+
+
+class PaperCalculatorHitTest(KeyHitTestCasesPage):
+
+  def __init__(self, page_set):
+    super(PaperCalculatorHitTest, self).__init__(
+      # Generated from https://github.com/zqureshi/paper-calculator
+      # vulcanize --inline --strip paper-calculator/demo.html
+      url='file://key_hit_test_cases/paper-calculator-no-rendering.html',
+      page_set=page_set)
+
+  def RunSmoothness(self, action_runner):
+    action_runner.Wait(2)
+    for _ in xrange(100):
+        self.TapButton(action_runner)
+
+  def TapButton(self, action_runner):
+    interaction = action_runner.BeginInteraction(
+        'Action_TapAction', is_smooth=True)
+    action_runner.TapElement(element_function='''
+        document.querySelector(
+            'body /deep/ #outerPanels'
+        ).querySelector(
+            '#standard'
+        ).shadowRoot.querySelector(
+            'paper-calculator-key[label="5"]'
+        )''')
+    interaction.End()
+
+
+class KeyHitTestCasesPageSet(page_set_module.PageSet):
+
+  def __init__(self):
+    super(KeyHitTestCasesPageSet, self).__init__(
+      user_agent_type='mobile')
+
+    self.AddPage(PaperCalculatorHitTest(self))