Move data use measurement to DataUseNetworkDelegate

components/data_use_measurement/core/BUILD.gn

 # 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.
 
 static_library("core") {
   sources = [
-    "data_use.cc",
-    "data_use.h",
-    "data_use_ascriber.cc",
-    "data_use_ascriber.h",
-    "data_use_network_delegate.cc",
-    "data_use_network_delegate.h",
-    "data_use_recorder.cc",
-    "data_use_recorder.h",
     "data_use_user_data.cc",
     "data_use_user_data.h",
   ]
   deps = [
     "//base",
     "//net",
   ]
 }
+
+static_library("ascriber") {

[RyanSturm, 2016/11/10 22:50:30]

Why the seperate lib? 

[Raj, 2016/11/10 23:20:26]

Library with core files data_use_user_data.* is enough where AttachToFetcher()
is used to label other components/libs (search for
//components/data_use_measurement/core). Otherwise the ascriber files are added.

+  sources = [
+    "data_use.cc",
+    "data_use.h",
+    "data_use_ascriber.cc",
+    "data_use_ascriber.h",
+    "data_use_measurement.cc",
+    "data_use_measurement.h",
+    "data_use_network_delegate.cc",
+    "data_use_network_delegate.h",
+    "data_use_recorder.cc",
+    "data_use_recorder.h",
+  ]
+  deps = [
+    ":core",
+    "//base",
+    "//components/metrics:metrics",
+    "//net",
+  ]
+}
+
+source_set("unit_tests") {
+  sources = [
+    "data_use_measurement_unittest.cc",
+    "data_use_network_delegate_unittest.cc",
+  ]
+  testonly = true
+  deps = [
+    ":ascriber",
+    ":core",
+    "//base/test:test_support",
+    "//net:test_support",
+    "//testing/gtest",
+  ]
+}