Reland of Port memory.long_running_idle_gmail benchmarks to TBMv2.

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 9b46f8c2c96948e5f7db9439595ff795a735977a..302cddf52617a1cf52e9642294046a10040aaa9c 100644
--- a/tools/perf/page_sets/long_running_idle_google_cases.py
+++ b/tools/perf/page_sets/long_running_idle_google_cases.py
@@ -6,19 +6,20 @@ from telemetry import story
 
 from page_sets import google_pages
 
-STARTUP_TIME_IN_SECONDS = 2
 IDLE_TIME_IN_SECONDS = 100
+SAMPLING_INTERVAL_IN_SECONDS = 1
+STEPS = IDLE_TIME_IN_SECONDS / SAMPLING_INTERVAL_IN_SECONDS
+
+def _IdleAction(action_runner):
+  action_runner.tab.browser.DumpMemory()
+  for _ in xrange(STEPS):
+    action_runner.Wait(SAMPLING_INTERVAL_IN_SECONDS)
+    action_runner.tab.browser.DumpMemory()
 
 def _CreateIdlePageClass(base_page_cls):
   class DerivedIdlePage(base_page_cls):  # pylint: disable=no-init
     def RunPageInteractions(self, action_runner):
-      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()
+      _IdleAction(action_runner)
   return DerivedIdlePage
 
 
@@ -26,7 +27,7 @@ def _CreateIdleBackgroundPageClass(base_page_cls):
   class DerivedIdlePage(base_page_cls):  # pylint: disable=no-init
     def RunPageInteractions(self, action_runner):
       action_runner.tab.browser.tabs.New()
-      action_runner.Wait(IDLE_TIME_IN_SECONDS)
+      _IdleAction(action_runner)
   return DerivedIdlePage