Telemetry: extends Platform abstraction.

tools/telemetry/telemetry/scrolling_interaction.py

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 import os
 
 from telemetry import page_interaction
 from telemetry import util
 
 class ScrollingInteraction(page_interaction.PageInteraction):
   def __init__(self, attributes=None):
     super(ScrollingInteraction, self).__init__(attributes)
 
   def PerformInteraction(self, page, tab):
     scroll_js_path = os.path.join(os.path.dirname(__file__), 'scroll.js')
     scroll_js = open(scroll_js_path, 'r').read()
 
     # Run scroll test.
     tab.runtime.Execute(scroll_js)
 
-    with tab.browser.platform.GetSurfaceCollector(''):
+    if tab.browser.platform.IsRawDisplayFrameRateSupported():
+      tab.browser.platform.StartRawDisplayFrameRate('')
+    start_scroll_js = """
+      window.__renderingStatsDeltas = null;
+      new __ScrollTest(function(rendering_stats_deltas) {
+        window.__renderingStatsDeltas = rendering_stats_deltas;
+      }).start(element);
+    """
+    # scrollable_element_function is a function that passes the scrollable
+    # element on the page to a callback. For example:
+    #   function (callback) {
+    #     callback(document.getElementById('foo'));
+    #   }
+    if hasattr(self, 'scrollable_element_function'):
+      tab.runtime.Execute('(%s)(function(element) { %s });' %
+                          (self.scrollable_element_function, start_scroll_js))
+    else:
+      tab.runtime.Execute(
+          '(function() { var element = document.body; %s})();' %
+          start_scroll_js)
 
-      start_scroll_js = """
-        window.__renderingStatsDeltas = null;
-        new __ScrollTest(function(rendering_stats_deltas) {
-          window.__renderingStatsDeltas = rendering_stats_deltas;
-        }).start(element);
-      """
-      # scrollable_element_function is a function that passes the scrollable
-      # element on the page to a callback. For example:
-      #   function (callback) {
-      #     callback(document.getElementById('foo'));
-      #   }
-      if hasattr(self, 'scrollable_element_function'):
-        tab.runtime.Execute('(%s)(function(element) { %s });' %
-                            (self.scrollable_element_function, start_scroll_js))
-      else:
-        tab.runtime.Execute(
-            '(function() { var element = document.body; %s})();' %
-            start_scroll_js)
-
-      # Poll for scroll benchmark completion.
-      util.WaitFor(lambda: tab.runtime.Evaluate(
-          'window.__renderingStatsDeltas'), 60)
+    # Poll for scroll benchmark completion.
+    util.WaitFor(lambda: tab.runtime.Evaluate(
+        'window.__renderingStatsDeltas'), 60)
+    if tab.browser.platform.IsRawDisplayFrameRateSupported():
+      tab.browser.platform.GetRawDisplayFrameRate()