[telemetry] Move tab from RunState to PageState.

tools/perf/measurements/memory_pressure.py

 # Copyright 2013 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.
 
 """Multi tab memory test.
 
 This test is a multi tab test, but we're interested in measurements for
 the entire test rather than each single page.
 """
 
 import logging
 
 from metrics import histogram_util
 from telemetry.page import page_measurement
 
+
 class MemoryPressure(page_measurement.PageMeasurement):
   def __init__(self, *args, **kwargs):
     super(MemoryPressure, self).__init__(*args, **kwargs)
     # _first_tab is used to access histograms
     self._is_first_page = True
     self._tab_count = 0
 
   # Allow histogram collection
   def CustomizeBrowserOptions(self, options):
     histogram_util.CustomizeBrowserOptions(options)
 
   # Open a new tab at each page
-  def TabForPage(self, page, tab):
-    return tab.browser.tabs.New()
+  def TabForPage(self, page, browser):
+    return browser.tabs.New()
 
   def GetTabsHistogramCounts(self, tab):
     histogram_type = histogram_util.BROWSER_HISTOGRAM
     discard_count = histogram_util.GetHistogramCount(
       histogram_type, "Tabs.Discard.DiscardCount", tab)
     kill_count = histogram_util.GetHistogramCount(
       histogram_type, "Tabs.SadTab.KillCreated", tab)
     return (discard_count, kill_count)
 
-  def DidRunPageRepeats(self, page, tab):
+  def MeasurePage(self, page, tab, results):
     # After navigating to each page, check if it triggered tab discards or
     # kills.
     (discard_count, kill_count) = self.GetTabsHistogramCounts(tab)
     # Done with this tab.  Disconnect cleanly from it to avoid a possible
     # TabCrashException if the tab is discarded or killed.
     tab.Disconnect()
     # Sanity check for first page
     if self._is_first_page:
       self._is_first_page = False
       assert discard_count == 0 and kill_count == 0
 
     self._tab_count += 1
     # End the test at the first kill or discard.
     if kill_count > 0 or discard_count > 0:
       logging.info("test ending at tab %d, discards = %d, kills = %d" %
         (self._tab_count, discard_count, kill_count))
       self.RequestExit()
-
-  def MeasurePage(self, page, tab, results):  # pylint: disable=W0613
-    pass