Collect profiler stats from browser child processes.

content/browser/profiler_controller_impl.h

+// Copyright (c) 2011 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 CONTENT_BROWSER_PROFILER_CONTROLLER_IMPL_H_
+#define CONTENT_BROWSER_PROFILER_CONTROLLER_IMPL_H_
+
+#include "base/memory/singleton.h"
+#include "content/common/content_export.h"
+#include "content/public/browser/profiler_controller.h"
+
+namespace content {
+
+// ProfilerController's implementation.
+class CONTENT_EXPORT ProfilerControllerImpl : public ProfilerController {
+ public:
+  static ProfilerControllerImpl* GetInstance();
+
+  // Normally instantiated when the child process is launched. Only one instance
+  // should be created per process.
+  ProfilerControllerImpl();
+  virtual ~ProfilerControllerImpl();
+
+  // Send number of pending processes to subscriber_. |end| is set to true if it
+  // is the last time. This is called on UI thread.
+  void OnPendingProcesses(int sequence_number, int pending_processes, bool end);
+
+  // Send profiler_data back to subscriber_. subscriber_ assumes the ownership
+  // of profiler_data. This is called on UI thread.
+  void OnProfilerDataCollected(int sequence_number,
+                               base::DictionaryValue* profiler_data);
+
+  // ProfilerController implementation:
+  virtual void Register(ProfilerSubscriber* subscriber) OVERRIDE;
+  virtual void Unregister(ProfilerSubscriber* subscriber) OVERRIDE;
+  virtual void GetProfilerData(int sequence_number) OVERRIDE;
+  virtual void SetProfilerStatus(bool enable) OVERRIDE;
+
+ private:
+  friend struct DefaultSingletonTraits<ProfilerControllerImpl>;
+
+  // Contact child processes and get their profiler data.
+  void GetProfilerDataFromChildProcesses(int sequence_number);
+
+  // Contact child processes and set profiler status to |enable|.
+  void SetProfilerStatusInChildProcesses(bool enable);
+
+  ProfilerSubscriber* subscriber_;
+
+  DISALLOW_COPY_AND_ASSIGN(ProfilerControllerImpl);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_PROFILER_CONTROLLER_IMPL_H_
+