[Telemetry] Add run_no_page_interactions options to key_silk_cases page.

This is to prepare for switching rasterize_and_micro_record's
action_name_to_run from empty string to 'RunPageInteractions'.

BUG=418375

Review URL: https://codereview.chromium.org/924133002

Cr-Commit-Position: refs/heads/master@{#316315}

tools/perf/benchmarks/rasterize_and_record_micro.py

@@ -70,12 +70,14 @@ class RasterizeAndRecordMicroKeySilkCases(_RasterizeAndRecordMicro):
   """Measures rasterize and record performance on the silk sites.
 
   http://www.chromium.org/developers/design-documents/rendering-benchmarks"""
-  page_set = page_sets.KeySilkCasesPageSet
 
   @classmethod
   def Name(cls):
     return 'rasterize_and_record_micro.key_silk_cases'
 
+  def CreatePageSet(self, options):
+    return page_sets.KeySilkCasesPageSet(run_no_page_interactions=True)
+
 
 @benchmark.Enabled('android')
 class RasterizeAndRecordMicroPolymer(_RasterizeAndRecordMicro):