tracing: the client lib of the tracing service

services/resource_coordinator/public/cpp/tracing/chrome_trace_event_agent.h

Index: services/resource_coordinator/public/cpp/tracing/chrome_trace_event_agent.h
diff --git a/services/resource_coordinator/public/cpp/tracing/chrome_trace_event_agent.h b/services/resource_coordinator/public/cpp/tracing/chrome_trace_event_agent.h
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+// Copyright 2017 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.
+
+#ifndef SERVICES_RESOURCE_COORDINATOR_PUBLIC_CPP_TRACING_CHROME_TRACE_EVENT_AGENT_H_
+#define SERVICES_RESOURCE_COORDINATOR_PUBLIC_CPP_TRACING_CHROME_TRACE_EVENT_AGENT_H_
+
+#include "base/memory/ref_counted.h"
+#include "base/memory/ref_counted_memory.h"
+#include "base/threading/thread_checker.h"
+#include "mojo/public/cpp/bindings/binding.h"
+#include "services/resource_coordinator/public/cpp/resource_coordinator_export.h"
+#include "services/resource_coordinator/public/interfaces/tracing/tracing.mojom.h"
+#include "services/service_manager/public/cpp/connector.h"
+
+namespace base {
+class DictionaryValue;
+}
+
+namespace tracing {
+
+class SERVICES_RESOURCE_COORDINATOR_PUBLIC_CPP_EXPORT ChromeTraceEventAgent
+    : public mojom::Agent {
+ public:
+  using MetadataGeneratorFunction =
+      base::RepeatingCallback<std::unique_ptr<base::DictionaryValue>()>;
+
+  static ChromeTraceEventAgent* GetInstance();
+
+  void AddMetadataGeneratorFunction(MetadataGeneratorFunction generator);
+
+ private:
+  friend std::default_delete<ChromeTraceEventAgent>;  // For Testing
+  friend class ChromeTraceEventAgentTest;             // For Testing
+
+  explicit ChromeTraceEventAgent(mojom::AgentRegistryPtr agent_registry);
+  ~ChromeTraceEventAgent() override;
+
+  // mojom::Agent
+  void StartTracing(const std::string& config,
+                    mojom::RecorderPtr recorder,
+                    const StartTracingCallback& callback) override;
+  void StopAndFlush() override;
+  void RequestClockSyncMarker(
+      const std::string& sync_id,
+      const RequestClockSyncMarkerCallback& callback) override;
+  void RequestBufferStatus(
+      const RequestBufferStatusCallback& callback) override;
+  void GetCategories(const GetCategoriesCallback& callback) override;
+
+  void OnTraceLogFlush(const scoped_refptr<base::RefCountedString>& events_str,
+                       bool has_more_events);
+
+  mojo::Binding<mojom::Agent> binding_;
+  mojom::RecorderPtr recorder_;
+  std::vector<MetadataGeneratorFunction> metadata_generator_functions_;
+  bool trace_log_needs_me_ = false;
+
+  THREAD_CHECKER(thread_checker_);
+
+  DISALLOW_COPY_AND_ASSIGN(ChromeTraceEventAgent);
+};
+
+}  // namespace tracing
+#endif  // SERVICES_RESOURCE_COORDINATOR_PUBLIC_CPP_TRACING_CHROME_TRACE_EVENT_AGENT_H_