Move tracked prefs into services/preferences/tracked.

services/preferences/public/cpp/tracked/BUILD.gn

Index: services/preferences/public/cpp/tracked/BUILD.gn
diff --git a/services/preferences/public/cpp/tracked/BUILD.gn b/services/preferences/public/cpp/tracked/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..94472fba8fe55d0ad5099b9fb6eee2b08c99c4c9
--- /dev/null
+++ b/services/preferences/public/cpp/tracked/BUILD.gn
@@ -0,0 +1,45 @@
+# 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.
+
+static_library("tracked") {
+  sources = [
+    "configuration.cc",
+    "configuration.h",
+    "pref_names.cc",
+    "pref_names.h",
+    "tracked_preference_histogram_names.cc",
+    "tracked_preference_histogram_names.h",
+  ]
+
+  if (is_win || is_mac) {
+    sources -= [ "device_id_stub.cc" ]

[gab, 2017/03/29 16:27:56]

device_id_stub.cc isn't in the public list so this belongs in the non-public GN
list

[Sam McNally, 2017/03/30 02:23:22]

Done.

+  }
+
+  # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
+  configs += [ "//build/config/compiler:no_size_t_to_int_warning" ]

[gab, 2017/03/29 16:27:56]

Maybe this can go away as well?

[Sam McNally, 2017/03/30 02:23:22]

Done.

+
+  public_deps = [
+    "//services/preferences/public/interfaces",
+  ]
+
+  deps = [
+    "//base:base",
+    "//components/pref_registry",
+    "//components/prefs",
+    "//crypto:crypto",

[gab, 2017/03/29 16:27:56]

Why is crypto needed? Think you only need it in non-public list

Actually I think you only need //base as deps and /public/interfaces as
public_deps?

[Sam McNally, 2017/03/30 02:23:22]

Done.

+  ]
+}
+
+static_library("test_support") {
+  testonly = true
+  sources = [
+    "mock_validation_delegate.cc",
+    "mock_validation_delegate.h",
+  ]
+
+  deps = [
+    "//base:base",
+    "//services/preferences/public/interfaces",
+  ]
+}