NOCOMMIT PROTOTYPE [GRC] Tab CPU Usage Observer

services/resource_coordinator/coordination_unit/tab_cpu_usage_observer.h

Index: services/resource_coordinator/coordination_unit/tab_cpu_usage_observer.h
diff --git a/services/resource_coordinator/coordination_unit/tab_cpu_usage_observer.h b/services/resource_coordinator/coordination_unit/tab_cpu_usage_observer.h
new file mode 100644
index 0000000000000000000000000000000000000000..787033a437b8b99f5b9320123ab0ebf491e13252
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+++ b/services/resource_coordinator/coordination_unit/tab_cpu_usage_observer.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_COORDINATION_UNIT_TAB_CPU_USAGE_OBSERVER_H_
+#define SERVICES_RESOURCE_COORDINATOR_COORDINATION_UNIT_TAB_CPU_USAGE_OBSERVER_H_
+
+#include <memory>
+#include <string>
+#include <unordered_map>
+
+#include "base/macros.h"
+#include "services/resource_coordinator/coordination_unit/coordination_unit_graph_observer.h"
+
+namespace resource_coordinator {
+
+class CoordinationUnitImpl;
+class TabCPUUsageObserver;
+
+class TabObserver {
+ public:
+  TabObserver();
+  ~TabObserver();
+
+  static const unsigned int kMaxCPUUsageMeasurementTicks;
+
+  bool IsObserving();
+  void AttributeCPUUsage(double cpu_usage);
+  void SetTabCPUUsageObserver(TabCPUUsageObserver* tab_cpu_usage_observer) {
+    tab_cpu_usage_observer_ = tab_cpu_usage_observer;
+  }
+
+  void TabURLChanged(const CoordinationUnitImpl* tab_coordination_unit,
+                     mojom::PropertyType tab_url_property);
+
+ private:
+  unsigned int cpu_measurement_ticks_;
+  TabCPUUsageObserver* tab_cpu_usage_observer_;
+  std::string url_;
+
+  DISALLOW_COPY_AND_ASSIGN(TabObserver);
+};
+
+class ProcessObserver {
+ public:
+  ProcessObserver();
+  ~ProcessObserver();
+
+  void NewCPUUsageMeasurement(const CoordinationUnitImpl* coordination_unit,
+                              mojom::PropertyType process_cpu_usage);
+  void RecalculateAttributableTabs(
+      const CoordinationUnitImpl* coordination_unit,
+      const CoordinationUnitImpl* frame_coordination_unit);
+  void SetTabCPUUsageObserver(TabCPUUsageObserver* tab_cpu_usage_observer) {
+    tab_cpu_usage_observer_ = tab_cpu_usage_observer;
+  }
+
+ private:
+  std::unordered_map<CoordinationUnitID, TabObserver*> attributable_tabs_;
+  TabCPUUsageObserver* tab_cpu_usage_observer_;
+
+  DISALLOW_COPY_AND_ASSIGN(ProcessObserver);
+};
+
+class TabCPUUsageObserver : public CoordinationUnitGraphObserver {
+ public:
+  TabCPUUsageObserver();
+  ~TabCPUUsageObserver() override;
+
+  std::unordered_map<CoordinationUnitID, ProcessObserver>& process_observers() {
+    return process_observers_;
+  }
+  std::unordered_map<CoordinationUnitID, TabObserver>& tab_observers() {
+    return tab_observers_;
+  }
+
+  void CoordinationUnitCreated(
+      CoordinationUnitImpl* coordination_unit) override;
+
+  void ProcessCoordinationUnitCreated(
+      CoordinationUnitImpl* process_coordination_unit);
+  void TabCoordinationUnitCreated(CoordinationUnitImpl* tab_coordination_unit);
+
+  void RemoveProcessObserver(
+      const CoordinationUnitImpl* process_coordination_unit);
+  void RemoveTabObserver(const CoordinationUnitImpl* tab_coordination_unit);
+
+ private:
+  std::unordered_map<CoordinationUnitID, ProcessObserver> process_observers_;
+  std::unordered_map<CoordinationUnitID, TabObserver> tab_observers_;
+
+  DISALLOW_COPY_AND_ASSIGN(TabCPUUsageObserver);
+};
+
+}  // namespace resource_coordinator
+
+#endif  // SERVICES_RESOURCE_COORDINATOR_COORDINATION_UNIT_TAB_CPU_USAGE_OBSERVER_H_