Adding a test for measuring memory usage.

tools/telemetry/telemetry/multi_page_benchmark.py

Index: tools/telemetry/telemetry/multi_page_benchmark.py
diff --git a/tools/telemetry/telemetry/multi_page_benchmark.py b/tools/telemetry/telemetry/multi_page_benchmark.py
index a17a031d815738470cb9087070707f2f273505ac..b24374cc09f2a64b6d9f8d6ab89646eb64aa93c2 100644
--- a/tools/telemetry/telemetry/multi_page_benchmark.py
+++ b/tools/telemetry/telemetry/multi_page_benchmark.py
@@ -138,7 +138,7 @@ class MultiPageBenchmark(page_test.PageTest):
   To add test-specific options:
 
      class BodyChildElementBenchmark(MultiPageBenchmark):
-        def AddOptions(parser):
+        def AddCommandLineOptions(parser):
            parser.add_option('--element', action='store', default='body')
 
         def MeasurePage(self, page, tab, results):
@@ -146,8 +146,8 @@ class MultiPageBenchmark(page_test.PageTest):
               'document.querySelector('%s').children.length')
            results.Add('children', 'count', child_count)
   """
-  def __init__(self):
-    super(MultiPageBenchmark, self).__init__('_RunTest')
+  def __init__(self, interaction_name=''):
+    super(MultiPageBenchmark, self).__init__('_RunTest', interaction_name)
 
   def _RunTest(self, page, tab, results):
     results.WillMeasurePage(page)