Complete the layered architecture of data_use_measurement component.

components/data_use_measurement/core/data_use_measurement.h

Index: components/data_use_measurement/core/data_use_measurement.h
diff --git a/components/data_use_measurement/content/data_use_measurement.h b/components/data_use_measurement/core/data_use_measurement.h
similarity index 87%
rename from components/data_use_measurement/content/data_use_measurement.h
rename to components/data_use_measurement/core/data_use_measurement.h
index a5b8f7136359a70c26fe085c11fb0471549bb004..e250ec3dfd8e723261bfa02200995b4c87dbe380 100644
--- a/components/data_use_measurement/content/data_use_measurement.h
+++ b/components/data_use_measurement/core/data_use_measurement.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef COMPONENTS_DATA_USE_MEASUREMENT_CONTENT_DATA_USE_MEASUREMENT_H_
-#define COMPONENTS_DATA_USE_MEASUREMENT_CONTENT_DATA_USE_MEASUREMENT_H_
+#ifndef COMPONENTS_DATA_USE_MEASUREMENT_CORE_DATA_USE_MEASUREMENT_H_
+#define COMPONENTS_DATA_USE_MEASUREMENT_CORE_DATA_USE_MEASUREMENT_H_
 
 #include <stdint.h>
 
@@ -12,6 +12,7 @@
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "build/build_config.h"
+#include "components/data_use_measurement/core/data_use_measurement_delegate.h"
 #include "components/data_use_measurement/core/data_use_user_data.h"
 
 #if defined(OS_ANDROID)
@@ -32,7 +33,8 @@ namespace data_use_measurement {
 // http://crbug.com/527460
 class DataUseMeasurement {
  public:
-  DataUseMeasurement();
+  // This class gets the ownership of data_use_measurement_delegate object.
+  DataUseMeasurement(DataUseMeasurementDelegate* data_use_measurement_delegate);
   ~DataUseMeasurement();
 
   // Records the data use of the |request|, thus |request| must be non-null.
@@ -81,6 +83,8 @@ class DataUseMeasurement {
       TrafficDirection dir,
       int64_t message_size) const;
 
+  scoped_ptr<DataUseMeasurementDelegate> data_use_measurement_delegate_;
+
 #if defined(OS_ANDROID)
   // Application listener store the last known state of the application in this
   // field.
@@ -96,4 +100,4 @@ class DataUseMeasurement {
 
 }  // namespace data_use_measurement
 
-#endif  // COMPONENTS_DATA_USE_MEASUREMENT_CONTENT_DATA_USE_MEASUREMENT_H_
+#endif  // COMPONENTS_DATA_USE_MEASUREMENT_CORE_DATA_USE_MEASUREMENT_H_