Re-land first pass BackgroundTracingManager.

content/public/browser/background_tracing_config.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 "content/public/browser/background_tracing_config.h"
+
+#include "content/public/browser/background_tracing_manager.h"
+#include "content/public/browser/background_tracing_preemptive_config.h"
+#include "content/public/browser/background_tracing_reactive_config.h"
+#include "content/public/browser/background_tracing_upload_sink.h"
+
+namespace content {
+
+BackgroundTracingConfig::BackgroundTracingConfig(Mode mode) : mode(mode) {
+}
+
+BackgroundTracingConfig::~BackgroundTracingConfig() {
+}
+
+BackgroundTracingPreemptiveConfig::BackgroundTracingPreemptiveConfig()
+    : BackgroundTracingConfig(BackgroundTracingConfig::PREEMPTIVE_TRACING_MODE),
+      category_preset(BackgroundTracingConfig::BENCHMARK) {
+}
+
+BackgroundTracingPreemptiveConfig::~BackgroundTracingPreemptiveConfig() {
+}
+
+BackgroundTracingReactiveConfig::BackgroundTracingReactiveConfig()
+    : BackgroundTracingConfig(BackgroundTracingConfig::REACTIVE_TRACING_MODE) {
+}
+
+BackgroundTracingReactiveConfig::~BackgroundTracingReactiveConfig() {
+}
+
+}  // namespace content