New Task Manager - Phase 1.1: Implement Browser Process Task Providing

chrome/browser/task_management/providers/browser_process/browser_process_task_provider.h

+// 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.
+
+#ifndef CHROME_BROWSER_TASK_MANAGEMENT_PROVIDERS_BROWSER_PROCESS_BROWSER_PROCESS_TASK_PROVIDER_H_
+#define CHROME_BROWSER_TASK_MANAGEMENT_PROVIDERS_BROWSER_PROCESS_BROWSER_PROCESS_TASK_PROVIDER_H_
+
+#include "chrome/browser/task_management/providers/browser_process/browser_process_task.h"
+#include "chrome/browser/task_management/providers/task_provider.h"
+
+namespace task_management {
+
+// This provides the browser process task which lives as long as the browser
+// lives.
+class BrowserProcessTaskProvider : public TaskProvider {
+ public:
+  BrowserProcessTaskProvider();
+  ~BrowserProcessTaskProvider() override;
+
+  // task_management::TaskProvider:
+  Task* GetTaskOfUrlRequest(int origin_pid,

[Lei Zhang, 2015/04/01 22:47:50]

Unless someone needs to call BrowserProcessTaskProvider::GetTaskOfUrlRequest()
directly, this can be private too.

[afakhry, 2015/04/03 01:51:00]

This is one of the discussions I had with ncarter@ about whether to keep it
public as in the base class or to hide it here.

We agreed that as long as it's public in the base class then we keep it public
in the derived, since it's possible to something like:

Base* base = static_cast<Base*>(derived*);
base->PublicInBase();

+                            int child_id,
+                            int route_id) override;
+
+ private:
+  // task_management::TaskProvider:
+  void StartUpdating() override;
+  void StopUpdating() override;
+
+  // This is the task that represents the one and only main browser process. It
+  // lives as long as the browser lives.
+  BrowserProcessTask browser_process_task_;
+
+  DISALLOW_COPY_AND_ASSIGN(BrowserProcessTaskProvider);
+};
+
+}  // namespace task_management
+
+#endif  // CHROME_BROWSER_TASK_MANAGEMENT_PROVIDERS_BROWSER_PROCESS_BROWSER_PROCESS_TASK_PROVIDER_H_