Some scaffolding for the task manager.

base/process_util_mac.mm

Index: base/process_util_mac.mm
diff --git a/base/process_util_mac.mm b/base/process_util_mac.mm
index da0b200e08665c4e79471254cf10dd4fde195bfb..183fe31ac774eeb703a69b30b62bafca2827dba1 100644
--- a/base/process_util_mac.mm
+++ b/base/process_util_mac.mm
@@ -199,6 +199,17 @@ size_t ProcessMetrics::GetPeakWorkingSetSize() const {
   return 0;
 }
 
+size_t ProcessMetrics::GetPrivateBytes() const {
+  return 0;
+}
+
+void ProcessMetrics::GetCommittedKBytes(CommittedKBytes* usage) const {
+}
+
+bool ProcessMetrics::GetWorkingSetKBytes(WorkingSetKBytes* ws_usage) const {
+  return false;
+}
+
 // ------------------------------------------------------------------------
 
 }  // namespace base