Amortize data usage using TrafficStats on Android.

components/data_usage.gypi

 # 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.
 {
   'targets': [
     {
       'target_name': 'data_usage_core',
       'type': 'static_library',
       'dependencies': [
         '../base/base.gyp:base',
         '../net/net.gyp:net',
         '../url/url.gyp:url_lib',
       ],
       'sources': [
         'data_usage/core/data_use.cc',
         'data_usage/core/data_use.h',
         'data_usage/core/data_use_aggregator.cc',
         'data_usage/core/data_use_aggregator.h',
+        'data_usage/core/data_use_amortizer.h',
         'data_usage/core/data_use_annotator.h',
       ]
     },
-  ]
+  ],
+  'conditions': [
+    ['OS=="android"', {
+      'targets': [
+        {
+          'target_name': 'data_usage_android',
+          'type': 'static_library',
+          'dependencies': [
+            ':data_usage_core',
+            '../base/base.gyp:base',
+            '../net/net.gyp:net',
+            '../url/url.gyp:url_lib',
+          ],
+          'sources': [
+            'data_usage/android/traffic_stats_amortizer.cc',
+            'data_usage/android/traffic_stats_amortizer.h',
+          ]
+        },
+      ]
+    }],  # OS=="android"
+  ],
 }