Adding a test for measuring memory usage.

tools/telemetry/telemetry/multi_page_benchmark_runner.py

Index: tools/telemetry/telemetry/multi_page_benchmark_runner.py
diff --git a/tools/telemetry/telemetry/multi_page_benchmark_runner.py b/tools/telemetry/telemetry/multi_page_benchmark_runner.py
index 48837eecd6f1c2eb38b596f1e1850a729602bb37..fa4a3ac6eacc85afd1daa821a377187d93df35fa 100755
--- a/tools/telemetry/telemetry/multi_page_benchmark_runner.py
+++ b/tools/telemetry/telemetry/multi_page_benchmark_runner.py
@@ -12,6 +12,7 @@ import traceback
 from telemetry import browser_finder
 from telemetry import browser_options
 from telemetry import multi_page_benchmark
+from telemetry import page_interaction
 from telemetry import page_runner
 from telemetry import page_set
 
@@ -86,7 +87,9 @@ def Main(benchmark_dir):
 
   ps = page_set.PageSet.FromFile(args[1])
 
-  benchmark.CustomizeBrowserOptions(options)
+  _Discover(os.path.dirname(__file__), page_interaction.PageInteraction)
+
+  benchmark.CustomizeBrowserOptions(ps, options)
   possible_browser = browser_finder.FindBrowser(options)
   if not possible_browser:
     print >> sys.stderr, """No browser found.\n