Refactoring scrolling_benchmark code into scrolling_interaction.py

tools/telemetry/telemetry/scrolling_interaction_unittest.py

Index: tools/telemetry/telemetry/scrolling_interaction_unittest.py
diff --git a/tools/telemetry/telemetry/scrolling_interaction_unittest.py b/tools/telemetry/telemetry/scrolling_interaction_unittest.py
new file mode 100644
index 0000000000000000000000000000000000000000..c92157fe3b863e209ffc34894256f98e6ade782c
--- /dev/null
+++ b/tools/telemetry/telemetry/scrolling_interaction_unittest.py
@@ -0,0 +1,36 @@
+# Copyright (c) 2012 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 os
+
+from telemetry import scrolling_interaction
+from telemetry import tab_test_case
+
+class ScrollingInteractionTest(tab_test_case.TabTestCase):
+  def testScrollingInteraction(self):
+    unittest_data_dir = os.path.join(os.path.dirname(__file__),
+                                     '..', 'unittest_data')
+    self._browser.SetHTTPServerDirectory(unittest_data_dir)
+    self._tab.page.Navigate(
+      self._browser.http_server.UrlOf('blank.html'))
+    self._tab.WaitForDocumentReadyStateToBeComplete()
+    self.assertEquals(self._tab.runtime.Evaluate('document.location.pathname;'),
+                      '/blank.html')
+
+    # Make page bigger than window so it's scrollable.
+    self._tab.runtime.Execute("""document.body.style.height =
+                              (2 * window.innerHeight + 1) + 'px';""")
+
+    self.assertEquals(self._tab.runtime.Evaluate('document.body.scrollTop'), 0)
+
+    i = scrolling_interaction.ScrollingInteraction()
+    i.PerformInteraction(self._tab.page, self._tab)
+
+    self.assertEquals(self._tab.runtime.Evaluate(
+        'document.body.scrollTop + window.innerHeight'),
+                      self._tab.runtime.Evaluate('document.body.scrollHeight'))
+
+    rendering_stats_deltas = self._tab.runtime.Evaluate(
+      'window.__renderingStatsDeltas')
+
+    self.assertTrue(rendering_stats_deltas['numFramesSentToScreen'] > 0)