There are some issues in power_LowMemorySuspend.
1. Inbox re-verification, after about 40 mins usage, inbox page would switch to account verification page and memory usage is greatly reduced. Changing the switching and suspending time to 40 mins instead of 1 hour as the system is no longer in low memory state after 40 mins.

2. DevToolsClientConnectionError when try to get active tab count

05/01 01:05:41.530 INFO |               job:0232| 		FAIL	power_LowMemorySuspend	power_LowMemorySuspend	timestamp=1525161941	localtime=May 01 01:05:41	Unhandled DevToolsClientConnectionError: timed out
  Traceback (most recent call last):
    File "/usr/local/autotest/common_lib/test.py", line 831, in _call_test_function
      return func(*args, **dargs)
    File "/usr/local/autotest/common_lib/test.py", line 495, in execute
      dargs)
    File "/usr/local/autotest/common_lib/test.py", line 362, in _call_run_once_with_retry
      postprocess_profiled_run, args, dargs)
    File "/usr/local/autotest/common_lib/test.py", line 400, in _call_run_once
      self.run_once(*args, **dargs)
    File "/usr/local/autotest/tests/power_LowMemorySuspend/power_LowMemorySuspend.py", line 109, in run_once
      suspend_seconds, additional_sleep)
    File "/usr/local/autotest/tests/power_LowMemorySuspend/power_LowMemorySuspend.py", line 96, in cycling_suspend
      self.check_tab_discard(cr, tabs)
    File "/usr/local/autotest/tests/power_LowMemorySuspend/power_LowMemorySuspend.py", line 60, in check_tab_discard
      active_tabs = len(cr.browser.tabs)
    File "/usr/local/telemetry/src/third_party/catapult/telemetry/telemetry/internal/browser/tab_list.py", line 15, in __len__
      return self._tab_list_backend.__len__()
    File "/usr/local/telemetry/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome_inspector/inspector_backend_list.py", line 95, in __len__
      self._Update()
    File "/usr/local/telemetry/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome_inspector/inspector_backend_list.py", line 99, in _Update
      backends_map = self._devtools_client.GetUpdatedInspectableContexts()
    File "/usr/local/telemetry/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome_inspector/devtools_client_backend.py", line 376, in GetUpdatedInspectableContexts
      contexts = self._ListInspectableContexts()
    File "/usr/local/telemetry/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome_inspector/devtools_client_backend.py", line 301, in _ListInspectableContexts
      return self._devtools_http.RequestJson('')
    File "/usr/local/telemetry/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome_inspector/devtools_http.py", line 107, in RequestJson
      return json.loads(self.Request(path, timeout))
    File "/usr/local/telemetry/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome_inspector/devtools_http.py", line 88, in Request
      response = self._conn.getresponse()
    File "/usr/local/lib64/python2.7/httplib.py", line 1132, in getresponse
      response.begin()
    File "/usr/local/lib64/python2.7/httplib.py", line 453, in begin
      version, status, reason = self._read_status()
    File "/usr/local/lib64/python2.7/httplib.py", line 409, in _read_status
      line = self.fp.readline(_MAXLINE + 1)
    File "/usr/local/lib64/python2.7/socket.py", line 480, in readline
      data = self._sock.recv(self._rbufsize)
  DevToolsClientConnectionError: timed out