Run GC after each memory test page

tools/perf/measurements/memory.py

Index: tools/perf/measurements/memory.py
diff --git a/tools/perf/measurements/memory.py b/tools/perf/measurements/memory.py
index 3349f56a8240c4a5eb2fed379a749c97cea06501..812457073c38f3d1843fba5df12bf3a9d3b88479 100644
--- a/tools/perf/measurements/memory.py
+++ b/tools/perf/measurements/memory.py
@@ -22,6 +22,9 @@ class Memory(page_test.PageTest):
     self._memory_metric.Start(page, tab)
     self._power_metric.Start(page, tab)
 
+  def CleanUpAfterPage(self, page, tab):
+    tab.CollectGarbage()

[haraken, 2015/03/23 09:41:41]

Just to confirm, but will this trigger enough numbers of V8 & Oilpan GCs?

[nednguyen, 2015/03/24 01:21:14]

What happen if the tab is already crashed here?

[kouhei (in TOK), 2015/03/24 02:25:22]

The line throws DevtoolsTargetCrashException and it goes to next test:

  _RunUserStoryAndProcessErrorIfNeeded at
tools/telemetry/telemetry/user_story/user_story_runner.py:110
    state.DidRunUserStory(results)
  DidRunUserStory at tools/telemetry/telemetry/page/shared_page_state.py:88
    self._test.CleanUpAfterPage(self._current_page, self._current_tab)
  CleanUpAfterPage at tools/perf/measurements/memory.py:26
    tab.CollectGarbage()
  CollectGarbage at tools/telemetry/telemetry/core/tab.py:232
    self._inspector_backend.CollectGarbage()
  inner at
tools/telemetry/telemetry/core/backends/chrome_inspector/inspector_backend.py:40
    inspector_backend._ConvertExceptionFromInspectorWebsocket(e)
  inner at
tools/telemetry/telemetry/core/backends/chrome_inspector/inspector_backend.py:37
    return func(inspector_backend, *args, **kwargs)
  CollectGarbage at
tools/telemetry/telemetry/core/backends/chrome_inspector/inspector_backend.py:317
    self._page.CollectGarbage()
  CollectGarbage at
tools/telemetry/telemetry/core/backends/chrome_inspector/inspector_page.py:156
    res = self._inspector_websocket.SyncRequest(request, timeout)
  SyncRequest at
tools/telemetry/telemetry/core/backends/chrome_inspector/inspector_websocket.py:100
    self.SendAndIgnoreResponse(req)
  SendAndIgnoreResponse at
tools/telemetry/telemetry/core/backends/chrome_inspector/inspector_websocket.py:88
    self._socket.send(data)
  send at tools/telemetry/third_party/websocket-client/websocket.py:567
    l = self._send(data)
  _send at tools/telemetry/third_party/websocket-client/websocket.py:726
    raise e
DevtoolsTargetCrashException: Devtools target crashed

+
   def CustomizeBrowserOptions(self, options):
     memory.MemoryMetric.CustomizeBrowserOptions(options)
     # Since this is a memory benchmark, we want to sample memory histograms at