PurgeMemory.

tools/perf/page_sets/blink_memory_mobile.py

Index: tools/perf/page_sets/blink_memory_mobile.py
diff --git a/tools/perf/page_sets/blink_memory_mobile.py b/tools/perf/page_sets/blink_memory_mobile.py
index cec25c8a8758892a976744b8366569273175f7ca..083bf86951c124079644c51bf67c98a0540bc234 100644
--- a/tools/perf/page_sets/blink_memory_mobile.py
+++ b/tools/perf/page_sets/blink_memory_mobile.py
@@ -24,8 +24,19 @@ class BlinkMemoryMobilePage(page_module.Page):
 
   def _DumpMemory(self, action_runner, phase):
     with action_runner.CreateInteraction(phase):
+      # before
+      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)
+      # after GC
       action_runner.Wait(DUMP_WAIT_TIME)
       action_runner.ForceGarbageCollection()
+      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)
+      # after pressure notification
+      action_runner.Wait(DUMP_WAIT_TIME)
+#      action_runner.ForceGarbageCollection()
       action_runner.SimulateMemoryPressureNotification('critical')
       action_runner.Wait(DUMP_WAIT_TIME)
       if not action_runner.tab.browser.DumpMemory():