[Tentaive patch for discussion] Add Purge+Suspend metrics as UMA.

tools/perf/page_sets/blink_memory_mobile.py

 # Copyright 2015 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 logging
 
 from telemetry.page import page as page_module
 from telemetry.page import shared_page_state
 from telemetry import story
 
 from page_sets.login_helpers import google_login
 
 
 DUMP_WAIT_TIME = 3
 
 
 class BlinkMemoryMobilePage(page_module.Page):
   def __init__(self, url, page_set, name):
     super(BlinkMemoryMobilePage, self).__init__(
         url=url, page_set=page_set, name=name,
         shared_page_state_class=shared_page_state.SharedMobilePageState,
         credentials_path='data/credentials.json')
     self.archive_data_file = 'data/blink_memory_mobile.json'
 
   def _DumpMemory(self, action_runner, phase):
     with action_runner.CreateInteraction(phase):
       action_runner.Wait(DUMP_WAIT_TIME)
+      # Open blank tab (Move the page to background).
+      action_runner.tab.browser.tabs.New()
+      action_runner.Wait(5)
       action_runner.ForceGarbageCollection()
-      action_runner.SimulateMemoryPressureNotification('critical')
+      if not action_runner.tab.browser.DumpMemory():
+        logging.error('Unable to get a memory dump for %s.', self.name)
+      action_runner.Wait(20)
+      #action_runner.SimulateMemoryPressureNotification('critical')
       action_runner.Wait(DUMP_WAIT_TIME)
       if not action_runner.tab.browser.DumpMemory():
         logging.error('Unable to get a memory dump for %s.', self.name)
 
   def RunPageInteractions(self, action_runner):
     action_runner.ScrollPage()
     self._DumpMemory(action_runner, 'scrolled')
 
 
 class TheVergePage(BlinkMemoryMobilePage):
@@ skipping 87 matching lines @@
     # Why: Key products.
     self.AddStory(GmailPage(page_set=self))
     self.AddStory(BlinkMemoryMobilePage(
         'http://googlewebmastercentral.blogspot.com/2015/04/rolling-out-mobile-friendly-update.html?m=1',
         page_set=self,
         name='Blogger'))
     self.AddStory(BlinkMemoryMobilePage(
         'https://plus.google.com/app/basic/110031535020051778989/posts?source=apppromo',
         page_set=self,
         name='GooglePlus'))