Framework to ascribe all network data use to a source.

chrome/browser/data_use_measurement/chrome_data_use_ascriber_service_factory.h

Index: chrome/browser/data_use_measurement/chrome_data_use_ascriber_service_factory.h
diff --git a/chrome/browser/data_use_measurement/chrome_data_use_ascriber_service_factory.h b/chrome/browser/data_use_measurement/chrome_data_use_ascriber_service_factory.h
new file mode 100644
index 0000000000000000000000000000000000000000..eb76d38335ee0d2affa43dadc964f82979f03152
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+++ b/chrome/browser/data_use_measurement/chrome_data_use_ascriber_service_factory.h
@@ -0,0 +1,44 @@
+// Copyright 2016 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_DATA_USE_MEASUREMENT_CHROME_DATA_USE_ASCRIBER_SERVICE_FACTORY_H_
+#define CHROME_BROWSER_DATA_USE_MEASUREMENT_CHROME_DATA_USE_ASCRIBER_SERVICE_FACTORY_H_
+
+#include "base/macros.h"
+#include "base/memory/singleton.h"

[Lei Zhang, 2016/09/08 22:04:43]

Please read the top of singleton.h and try using a LazyInstance instead.

[Not at Google. Contact bengr, 2016/09/09 18:37:16]

Don't have a choice in this case unfortunately. This class derives from
BrowserContextKeyedServiceFactory and must be a singleton as specified in
browser_context_keyed_service_factory.h.

On the bright side, this is a very popular pattern so should be safe:
https://cs.chromium.org/search/?q=Singleton+f:service_factory.h&p=1&sq=packag...

+#include "components/keyed_service/content/browser_context_keyed_service_factory.h"
+#include "components/keyed_service/core/keyed_service.h"
+
+namespace data_use_measurement {
+
+class ChromeDataUseAscriberService;
+
+class ChromeDataUseAscriberServiceFactory
+    : public BrowserContextKeyedServiceFactory {
+ public:
+  static ChromeDataUseAscriberService* GetForBrowserContext(
+      content::BrowserContext* context);
+
+  static ChromeDataUseAscriberServiceFactory* GetInstance();
+
+ private:
+  friend struct base::DefaultSingletonTraits<ChromeDataUseAscriberService>;
+
+  ChromeDataUseAscriberServiceFactory();
+  ~ChromeDataUseAscriberServiceFactory() override;
+
+  // BrowserContextKeyedServiceFactory:
+  KeyedService* BuildServiceInstanceFor(
+      content::BrowserContext* context) const override;
+
+ private:
+  friend struct base::DefaultSingletonTraits<
+      ChromeDataUseAscriberServiceFactory>;
+
+  DISALLOW_COPY_AND_ASSIGN(ChromeDataUseAscriberServiceFactory);
+};
+
+}  // namespace data_use_measurement
+
+#endif  // CHROME_BROWSER_DATA_USE_MEASUREMENT_CHROME_DATA_USE_ASCRIBER_SERVICE_FACTORY_H_