Chromium roll (https://codereview.chromium.org/976353002)

base/trace_event/process_memory_totals_dump_provider.cc

 // Copyright 2015 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.
 
 #include "base/trace_event/process_memory_totals_dump_provider.h"
 
 #include "base/process/process_metrics.h"
 #include "base/trace_event/process_memory_dump.h"
 #include "base/trace_event/process_memory_totals.h"
 
 namespace base {
 namespace trace_event {
 
 // static
 uint64 ProcessMemoryTotalsDumpProvider::rss_bytes_for_testing = 0;
 
 namespace {
+
+const char kDumperFriendlyName[] = "ProcessMemoryTotals";
+
 ProcessMetrics* CreateProcessMetricsForCurrentProcess() {
 #if !defined(OS_MACOSX) || defined(OS_IOS)
   return ProcessMetrics::CreateProcessMetrics(GetCurrentProcessHandle());
 #else
   return ProcessMetrics::CreateProcessMetrics(GetCurrentProcessHandle(), NULL);
 #endif
 }
 }  // namespace
 
 // static
 ProcessMemoryTotalsDumpProvider*
 ProcessMemoryTotalsDumpProvider::GetInstance() {
   return Singleton<
       ProcessMemoryTotalsDumpProvider,
       LeakySingletonTraits<ProcessMemoryTotalsDumpProvider>>::get();
 }
 
 ProcessMemoryTotalsDumpProvider::ProcessMemoryTotalsDumpProvider()
     : process_metrics_(CreateProcessMetricsForCurrentProcess()) {
 }
 
 ProcessMemoryTotalsDumpProvider::~ProcessMemoryTotalsDumpProvider() {
 }
 
 // Called at trace dump point time. Creates a snapshot the memory counters for
 // the current process.
-void ProcessMemoryTotalsDumpProvider::DumpInto(ProcessMemoryDump* pmd) {
+bool ProcessMemoryTotalsDumpProvider::DumpInto(ProcessMemoryDump* pmd) {
   const uint64 rss_bytes = rss_bytes_for_testing
                                ? rss_bytes_for_testing
                                : process_metrics_->GetWorkingSetSize();
-  pmd->process_totals()->set_resident_set_bytes(rss_bytes);
-  pmd->set_has_process_totals();
+
+  if (rss_bytes > 0) {
+    pmd->process_totals()->set_resident_set_bytes(rss_bytes);
+    pmd->set_has_process_totals();
+    return true;
+  }
+
+  return false;
+}
+
+const char* ProcessMemoryTotalsDumpProvider::GetFriendlyName() const {
+  return kDumperFriendlyName;
 }
 
 }  // namespace trace_event
 }  // namespace base