Chrome power profiler service

content/browser/power_profiler/power_data_provider.h

Index: content/browser/power_profiler/power_data_provider.h
diff --git a/content/browser/power_profiler/power_data_provider.h b/content/browser/power_profiler/power_data_provider.h
new file mode 100644
index 0000000000000000000000000000000000000000..987dfe056e8dcbee5af1b09a533a314ee2f45a11
--- /dev/null
+++ b/content/browser/power_profiler/power_data_provider.h
@@ -0,0 +1,60 @@
+// Copyright 2014 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_POWER_PROFILER_POWER_DATA_PROVIDER_H_
+#define CONTENT_BROWSER_POWER_PROFILER_POWER_DATA_PROVIDER_H_
+
+#include <vector>
+
+#include "base/basictypes.h"
+#include "base/time/time.h"
+
+namespace content {
+
+struct PowerEvent {
+  enum Type {
+    // Total power of SoC. including CPU, GT and others on the chip,
+    // modules which aren't part of the SoC such as the screen are not included.
+    SOC_PACKAGE,
+
+    // Whole device power.
+    DEVICE,
+
+    // Count the number of known PowerEvent. Keep this at the end.

[jeremy, 2014/02/17 06:31:13]

Just the second sentence is enough, the first  part is clear from context.

[Pan, 2014/02/17 07:53:37]

Done.

+    ID_COUNT
+  };
+
+  Type type;
+
+  base::TimeTicks time; // Time that power data was read.
+
+  // Power value between last event to this one, in watt.

[jeremy, 2014/02/17 06:31:13]

to -> and
watt -> watts

[Pan, 2014/02/17 07:53:37]

Done.

+  // E.g, event1 {t1, v1}; event2 {t2, v2}; event3 {t3, v3}.
+  // Suppose event1 is the first event the observer received, then event2,
+  // event3. Then v2 is the average power from t1 to t2, v3 is the average
+  // power from t2 to t3. v1 should be ignored since event1 only means the
+  // start point of power profiling.
+  double value;
+};
+
+extern const char* kPowerTypeNames[];
+
+typedef std::vector<PowerEvent> PowerEventVector;
+
+// A class used to get power usage.
+class PowerDataProvider {
+ public:
+  PowerDataProvider() {}
+  virtual ~PowerDataProvider() {}
+
+  // Returns a vector of power events, one per type, for the type it supports.
+  virtual PowerEventVector GetData() = 0;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(PowerDataProvider);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_POWER_PROFILER_POWER_DATA_PROVIDER_H_