Telemetry: integrates memory_measurement with TCMalloc dumps

tools/perf/perf_tools/memory_measurement.py

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 from perf_tools import histogram_metric
 from telemetry.page import page_measurement
 
 MEMORY_HISTOGRAMS = [
     {'name': 'V8.MemoryExternalFragmentationTotal', 'units': 'percent'},
     {'name': 'V8.MemoryHeapSampleTotalCommitted', 'units': 'kb'},
     {'name': 'V8.MemoryHeapSampleTotalUsed', 'units': 'kb'},
@@ skipping 28 matching lines @@
     options.AppendExtraBrowserArg('--disable-histogram-customizer')
     options.AppendExtraBrowserArg('--memory-metrics')
     options.AppendExtraBrowserArg('--reduce-security-for-dom-automation-tests')
 
   def CanRunForPage(self, page):
     return hasattr(page, 'stress_memory')
 
   def MeasurePage(self, page, tab, results):
     for h in self.histograms:
       h.GetValue(page, tab, results)
+
+    if tab.browser.is_profiler_active('tcmalloc-heap'):
+      # The tcmalloc_heap_profiler dumps files at regular
+      # intervals (~20 secs).
+      # This is a minor optimization to ensure it'll dump the last file when
+      # the test completes.
+      tab.ExecuteJavaScript("""
+        if (chrome && chrome.memoryBenchmarking) {
+          chrome.memoryBenchmarking.heapProfilerDump('final', 'renderer');
+          chrome.memoryBenchmarking.heapProfilerDump('final', 'browser');
+        }
+      """)