Replace memory.long_running_idle_gmail with TBM based version.

tools/perf/page_sets/long_running_idle_google_cases.py

Index: tools/perf/page_sets/long_running_idle_google_cases.py
diff --git a/tools/perf/page_sets/long_running_idle_google_cases.py b/tools/perf/page_sets/long_running_idle_google_cases.py
index ee3f5c7559a1e5172304be143e58438435698985..9b46f8c2c96948e5f7db9439595ff795a735977a 100644
--- a/tools/perf/page_sets/long_running_idle_google_cases.py
+++ b/tools/perf/page_sets/long_running_idle_google_cases.py
@@ -6,12 +6,19 @@ from telemetry import story
 
 from page_sets import google_pages
 
+STARTUP_TIME_IN_SECONDS = 2
 IDLE_TIME_IN_SECONDS = 100
 
 def _CreateIdlePageClass(base_page_cls):
   class DerivedIdlePage(base_page_cls):  # pylint: disable=no-init
     def RunPageInteractions(self, action_runner):
-      action_runner.Wait(IDLE_TIME_IN_SECONDS)
+      action_runner.Wait(STARTUP_TIME_IN_SECONDS)
+      with action_runner.CreateInteraction('Begin'):
+        action_runner.tab.browser.DumpMemory()
+      with action_runner.CreateInteraction('Idle'):
+        action_runner.Wait(IDLE_TIME_IN_SECONDS)
+      with action_runner.CreateInteraction('End'):
+        action_runner.tab.browser.DumpMemory()
   return DerivedIdlePage
 
 
@@ -39,4 +46,4 @@ class LongRunningIdleGmailBackgroundPageSet(story.StorySet):
         archive_data_file='data/long_running_idle_gmail_page.json',
         cloud_storage_bucket=story.PARTNER_BUCKET)
     self.AddStory(
-        _CreateIdleBackgroundPageClass(google_pages.GmailPage)(self))
+        _CreateIdleBackgroundPageClass(google_pages.GmailPage)(self))