Roll Chrome into Mojo.

base/debug/trace_event_system_stats_monitor.cc

Index: base/debug/trace_event_system_stats_monitor.cc
diff --git a/base/debug/trace_event_system_stats_monitor.cc b/base/debug/trace_event_system_stats_monitor.cc
deleted file mode 100644
index 9cbefd8d6cc14af406ce08d8ed33d3b20ac904f9..0000000000000000000000000000000000000000
--- a/base/debug/trace_event_system_stats_monitor.cc
+++ /dev/null
@@ -1,133 +0,0 @@
-// Copyright 2013 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/debug/trace_event_system_stats_monitor.h"
-
-#include "base/debug/leak_annotations.h"
-#include "base/debug/trace_event.h"
-#include "base/json/json_writer.h"
-#include "base/lazy_instance.h"
-#include "base/logging.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/strings/string_number_conversions.h"
-#include "base/strings/string_util.h"
-#include "base/thread_task_runner_handle.h"
-#include "base/threading/thread_local_storage.h"
-
-namespace base {
-namespace debug {
-
-namespace {
-
-/////////////////////////////////////////////////////////////////////////////
-// Holds profiled system stats until the tracing system needs to serialize it.
-class SystemStatsHolder : public base::debug::ConvertableToTraceFormat {
- public:
-  SystemStatsHolder() { }
-
-  // Fills system_metrics_ with profiled system memory and disk stats.
-  // Uses the previous stats to compute rates if this is not the first profile.
-  void GetSystemProfilingStats();
-
-  // base::debug::ConvertableToTraceFormat overrides:
-  void AppendAsTraceFormat(std::string* out) const override {
-    AppendSystemProfileAsTraceFormat(system_stats_, out);
-  }
-
- private:
-  ~SystemStatsHolder() override {}
-
-  SystemMetrics system_stats_;
-
-  DISALLOW_COPY_AND_ASSIGN(SystemStatsHolder);
-};
-
-void SystemStatsHolder::GetSystemProfilingStats() {
-  system_stats_ = SystemMetrics::Sample();
-}
-
-}  // namespace
-
-//////////////////////////////////////////////////////////////////////////////
-
-TraceEventSystemStatsMonitor::TraceEventSystemStatsMonitor(
-    scoped_refptr<SingleThreadTaskRunner> task_runner)
-    : task_runner_(task_runner),
-      weak_factory_(this) {
-  // Force the "system_stats" category to show up in the trace viewer.
-  TraceLog::GetCategoryGroupEnabled(TRACE_DISABLED_BY_DEFAULT("system_stats"));
-
-  // Allow this to be instantiated on unsupported platforms, but don't run.
-  TraceLog::GetInstance()->AddEnabledStateObserver(this);
-}
-
-TraceEventSystemStatsMonitor::~TraceEventSystemStatsMonitor() {
-  if (dump_timer_.IsRunning())
-    StopProfiling();
-  TraceLog::GetInstance()->RemoveEnabledStateObserver(this);
-}
-
-void TraceEventSystemStatsMonitor::OnTraceLogEnabled() {
-  // Check to see if system tracing is enabled.
-  bool enabled;
-
-  TRACE_EVENT_CATEGORY_GROUP_ENABLED(TRACE_DISABLED_BY_DEFAULT(
-                                     "system_stats"), &enabled);
-  if (!enabled)
-    return;
-  task_runner_->PostTask(
-      FROM_HERE,
-      base::Bind(&TraceEventSystemStatsMonitor::StartProfiling,
-                 weak_factory_.GetWeakPtr()));
-}
-
-void TraceEventSystemStatsMonitor::OnTraceLogDisabled() {
-  task_runner_->PostTask(
-      FROM_HERE,
-      base::Bind(&TraceEventSystemStatsMonitor::StopProfiling,
-                 weak_factory_.GetWeakPtr()));
-}
-
-void TraceEventSystemStatsMonitor::StartProfiling() {
-  // Watch for the tracing framework sending enabling more than once.
-  if (dump_timer_.IsRunning())
-    return;
-
-  dump_timer_.Start(FROM_HERE,
-                    TimeDelta::FromMilliseconds(TraceEventSystemStatsMonitor::
-                                                kSamplingIntervalMilliseconds),
-                    base::Bind(&TraceEventSystemStatsMonitor::
-                               DumpSystemStats,
-                               weak_factory_.GetWeakPtr()));
-}
-
-// If system tracing is enabled, dumps a profile to the tracing system.
-void TraceEventSystemStatsMonitor::DumpSystemStats() {
-  scoped_refptr<SystemStatsHolder> dump_holder = new SystemStatsHolder();
-  dump_holder->GetSystemProfilingStats();
-
-  TRACE_EVENT_OBJECT_SNAPSHOT_WITH_ID(
-      TRACE_DISABLED_BY_DEFAULT("system_stats"),
-      "base::TraceEventSystemStatsMonitor::SystemStats",
-      this,
-      scoped_refptr<ConvertableToTraceFormat>(dump_holder));
-}
-
-void TraceEventSystemStatsMonitor::StopProfiling() {
-  dump_timer_.Stop();
-}
-
-bool TraceEventSystemStatsMonitor::IsTimerRunningForTest() const {
-  return dump_timer_.IsRunning();
-}
-
-void AppendSystemProfileAsTraceFormat(const SystemMetrics& system_metrics,
-                                      std::string* output) {
-  std::string tmp;
-  base::JSONWriter::Write(system_metrics.ToValue().get(), &tmp);
-  *output += tmp;
-}
-
-}  // namespace debug
-}  // namespace base