Add second batch JS benchmark and code generator

tools/perf/page_sets/tough_scheduling_cases.py

Index: tools/perf/page_sets/tough_scheduling_cases.py
diff --git a/tools/perf/page_sets/tough_scheduling_cases.py b/tools/perf/page_sets/tough_scheduling_cases.py
index 9da9afc1786a1516efeb16972d5ae3e98af799bf..b30b8ee344b1accfc16ff1b3f3206d07499f7cf5 100644
--- a/tools/perf/page_sets/tough_scheduling_cases.py
+++ b/tools/perf/page_sets/tough_scheduling_cases.py
@@ -369,6 +369,35 @@ class SynchronizedScrollOffsetPage(ToughSchedulingCasesPage):
     interaction.End()
 
 
+class SecondBatchJsPage(ToughSchedulingCasesPage):
+
+  """Why: For testing dynamically loading a large batch of Javascript and
+          running a part of it in response to user input.
+  """
+
+  def __init__(self, page_set, variant='medium'):
+    super(SecondBatchJsPage, self).__init__(
+        url='file://tough_scheduling_cases/second_batch_js.html?%s' % variant,
+        page_set=page_set)
+
+  def RunPageInteractions(self, action_runner):
+    # Do a dummy tap to warm up the synthetic tap code path.
+    action_runner.TapElement(selector='div[id="spinner"]')
+    # Begin the action immediately because we want the page to update smoothly
+    # even while resources are being loaded.
+    action_runner.WaitForJavaScriptCondition('window.__ready !== undefined')
+
+    interaction = action_runner.BeginGestureInteraction('LoadAction')
+    action_runner.ExecuteJavaScript('kickOffLoading()')
+    action_runner.WaitForJavaScriptCondition('window.__ready')
+    # Click one second after the resources have finished loading.
+    action_runner.Wait(1)
+    action_runner.TapElement(selector='input[id="run"]')
+    # Wait for the test to complete.
+    action_runner.WaitForJavaScriptCondition('window.__finished')
+    interaction.End()
+
+
 class ToughSchedulingCasesPageSet(page_set_module.PageSet):
 
   """Tough scheduler latency test cases."""
@@ -441,7 +470,7 @@ class ToughSchedulingCasesPageSet(page_set_module.PageSet):
         slow_handler=True,
         bounce=False,
         page_set=self))
-      # Why: Slow handler blocks scroll start until touch ACK timeout
+    # Why: Slow handler blocks scroll start until touch ACK timeout
     self.AddUserStory(EmptyTouchHandlerPage(
         name='desktop_slow_handler',
         desktop=True,
@@ -464,7 +493,7 @@ class ToughSchedulingCasesPageSet(page_set_module.PageSet):
         slow_handler=True,
         bounce=True,
         page_set=self))
-      # Why: Scroll bounce with slow handler on desktop, blocks only once until
+    # Why: Scroll bounce with slow handler on desktop, blocks only once until
     # ACK timeout.
     self.AddUserStory(EmptyTouchHandlerPage(
         name='bounce_desktop_slow_handler',
@@ -472,5 +501,9 @@ class ToughSchedulingCasesPageSet(page_set_module.PageSet):
         slow_handler=True,
         bounce=True,
         page_set=self))
-      # Why: For measuring the latency of scroll-synchronized effects.
+    # Why: For measuring the latency of scroll-synchronized effects.
     self.AddUserStory(SynchronizedScrollOffsetPage(page_set=self))
+    # Why: Test loading a large amount of Javascript.
+    self.AddUserStory(SecondBatchJsPage(page_set=self, variant='light'))
+    self.AddUserStory(SecondBatchJsPage(page_set=self, variant='medium'))
+    self.AddUserStory(SecondBatchJsPage(page_set=self, variant='heavy'))