[Telemetry] Move dromaeo story disabling to StoryExpectations

Bug: 713222
Change-Id: Ice1cd5d0061aff3470aa61420de0244a6fd414a4
Reviewed-on: https://chromium-review.googlesource.com/521662
Commit-Queue: rnephew <rnephew@chromium.org>
Reviewed-by: Charlie Andrews <charliea@chromium.org>
Cr-Commit-Position: refs/heads/master@{#476458}

tools/perf/benchmarks/dromaeo.py

@@ -141,6 +141,11 @@ class DromaeoDomCoreAttr(_DromaeoBenchmark):
   def Name(cls):
     return 'dromaeo.domcoreattr'
 
+  def GetExpectations(self):
+    class StoryExpectations(story.expectations.StoryExpectations):
+      def SetExpectations(self):
+        pass # http://dromaeo.com?dom-attr not disabled.
+    return StoryExpectations()
 
 @benchmark.Owner(emails=['yukishiino@chromium.org',
                          'bashi@chromium.org',
@@ -157,6 +162,12 @@ class DromaeoDomCoreModify(_DromaeoBenchmark):
   def Name(cls):
     return 'dromaeo.domcoremodify'
 
+  def GetExpectations(self):
+    class StoryExpectations(story.expectations.StoryExpectations):
+      def SetExpectations(self):
+        pass # http://dromaeo.com?dom-modify not disabled.
+    return StoryExpectations()
+
 
 @benchmark.Owner(emails=['yukishiino@chromium.org',
                          'bashi@chromium.org',
@@ -173,6 +184,12 @@ class DromaeoDomCoreQuery(_DromaeoBenchmark):
   def Name(cls):
     return 'dromaeo.domcorequery'
 
+  def GetExpectations(self):
+    class StoryExpectations(story.expectations.StoryExpectations):
+      def SetExpectations(self):
+        pass # http://dromaeo.com?dom-query not disabled.
+    return StoryExpectations()
+
 
 @benchmark.Owner(emails=['yukishiino@chromium.org',
                          'bashi@chromium.org',
@@ -188,3 +205,9 @@ class DromaeoDomCoreTraverse(_DromaeoBenchmark):
   @classmethod
   def Name(cls):
     return 'dromaeo.domcoretraverse'
+
+  def GetExpectations(self):
+    class StoryExpectations(story.expectations.StoryExpectations):
+      def SetExpectations(self):
+        pass # http://dromaeo.com?dom-traverse not disabled.
+    return StoryExpectations()