Add memory stats for linux page cycler. On linux, we collect

base/process_util_win.cc

Index: base/process_util_win.cc
diff --git a/base/process_util_win.cc b/base/process_util_win.cc
index 265c26f03b09d3ea53b6c4af28ce0b1fe80fbdee..8b9ede863152a5aef885aa86f35a3b5046cad5b1 100644
--- a/base/process_util_win.cc
+++ b/base/process_util_win.cc
@@ -520,6 +520,15 @@ size_t ProcessMetrics::GetWorkingSetSize() const {
   return 0;
 }
 
+// Returns the peak working set size, in bytes.
+size_t ProcessMetrics::GetPeakWorkingSetSize() const {
+  PROCESS_MEMORY_COUNTERS pmc;
+  if (GetProcessMemoryInfo(process_, &pmc, sizeof(pmc))) {
+    return pmc.PeakWorkingSetSize;
+  }
+  return 0;
+}
+
 size_t ProcessMetrics::GetPrivateBytes() const {
   // PROCESS_MEMORY_COUNTERS_EX is not supported until XP SP2.
   // GetProcessMemoryInfo() will simply fail on prior OS. So the requested