[tools/perf] Add a broken page to dummy_benchmark.noisy_benchmark_1

*PERF SHERRIF: this CL intentionally breaks dummy_benchmark.noisy_benchmark_1
for intergration testing purpose.
Please coordinate with prasadv@ before your revert this.

BUG=537676, 581465

Review URL: https://codereview.chromium.org/1439453002

Cr-Commit-Position: refs/heads/master@{#371640}

tools/perf/benchmarks/dummy_benchmark.py

@@ -16,7 +16,7 @@ from core import perf_benchmark
 from telemetry.value import scalar
 from telemetry.page import page_test
 
-import page_sets
+from page_sets import dummy_story_set
 
 
 class _DummyTest(page_test.PageTest):
@@ -35,7 +35,7 @@ class _DummyTest(page_test.PageTest):
 
 
 class _DummyBenchmark(perf_benchmark.PerfBenchmark):
-  page_set = page_sets.DummyStorySet
+  page_set = dummy_story_set.DummyStorySet
 
 
 class DummyBenchmarkOne(_DummyBenchmark):
@@ -58,3 +58,9 @@ class DummyBenchmarkTwo(_DummyBenchmark):
   @classmethod
   def Name(cls):
     return 'dummy_benchmark.noisy_benchmark_1'
+
+  def CreateStorySet(self, options):
+    del options  # unused
+    story_set = dummy_story_set.DummyStorySet()
+    story_set.AddStory(dummy_story_set.BrokenDummyPage(story_set))
+    return story_set

tools/perf/page_sets/dummy_story_set.py

@@ -12,10 +12,23 @@ class DummyPage(page_module.Page):
       url='file://dummy_page.html',
       page_set=page_set)
 
-  def PerformPageInteractions(self, action_runner):
+  def RunPageInteractions(self, action_runner):
     assert action_runner.EvaluateJavaScript('1 + window.__dummy_value') == 2
 
 
+class BrokenDummyPage(page_module.Page):
+
+  def __init__(self, page_set):
+    super(BrokenDummyPage, self).__init__(
+      url='file://dummy_page.html',
+      name='Broken dummy page',
+      page_set=page_set)
+
+  def RunPageInteractions(self, action_runner):
+    # The call below should raise an AssertionError
+    assert action_runner.EvaluateJavaScript('1 + window.__dummy_value') == 3
+
+
 class DummyStorySet(story.StorySet):
 
   def __init__(self):