telemetry: Allow page tests to be configured via constructor

tools/perf/measurements/page_cycler.py

Index: tools/perf/measurements/page_cycler.py
diff --git a/tools/perf/measurements/page_cycler.py b/tools/perf/measurements/page_cycler.py
index d70b9110dcbe20518aaac9b306cf5f0ee7aebe63..f0fc6b341107ee5399ab858b9ff3135ab4f85e7f 100644
--- a/tools/perf/measurements/page_cycler.py
+++ b/tools/perf/measurements/page_cycler.py
@@ -46,9 +46,11 @@ class PageCycler(page_test.PageTest):
     self._v8_object_stats_metric = None
     self._has_loaded_page = collections.defaultdict(int)
     self._initial_renderer_url = None  # to avoid cross-renderer navigation
+    self._record_v8_object_stats = False
+    self._report_speed_index = False
+    self._cold_run_start_index = None
 
-  @classmethod
-  def AddCommandLineArgs(cls, parser):
+  def AddCommandLineArgs(self, parser):
     parser.add_option('--v8-object-stats',
         action='store_true',
         help='Enable detailed V8 object statistics.')
@@ -60,10 +62,9 @@ class PageCycler(page_test.PageTest):
     parser.add_option('--cold-load-percent', type='int', default=50,
                       help='%d of page visits for which a cold load is forced')
 
-  @classmethod
-  def ProcessCommandLineArgs(cls, parser, args):
-    cls._record_v8_object_stats = args.v8_object_stats
-    cls._report_speed_index = args.report_speed_index
+  def ProcessCommandLineArgs(self, parser, args):
+    self._record_v8_object_stats = args.v8_object_stats
+    self._report_speed_index = args.report_speed_index
 
     cold_runs_percent_set = (args.cold_load_percent != None)
     # Handle requests for cold cache runs
@@ -78,11 +79,11 @@ class PageCycler(page_test.PageTest):
       number_warm_pageset_runs = int(
           (int(args.pageset_repeat) - 1) * (100 - args.cold_load_percent) / 100)
       number_warm_runs = number_warm_pageset_runs * args.page_repeat
-      cls._cold_run_start_index = number_warm_runs + args.page_repeat
-      cls.discard_first_result = (not args.cold_load_percent or
-                                  cls.discard_first_result)
+      self._cold_run_start_index = number_warm_runs + args.page_repeat
+      self.discard_first_result = (not args.cold_load_percent or
+                                   self.discard_first_result)
     else:
-      cls._cold_run_start_index = args.pageset_repeat * args.page_repeat
+      self._cold_run_start_index = args.pageset_repeat * args.page_repeat
 
   def WillStartBrowser(self, platform):
     """Initialize metrics once right before the browser has been launched."""