Split //ios/chrome/browser in multiple targets.

ios/chrome/browser/reading_list/BUILD.gn

Index: ios/chrome/browser/reading_list/BUILD.gn
diff --git a/ios/chrome/browser/reading_list/BUILD.gn b/ios/chrome/browser/reading_list/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..2780b8b53382b2a45ea370841b81e1d011fd30dc
--- /dev/null
+++ b/ios/chrome/browser/reading_list/BUILD.gn
@@ -0,0 +1,60 @@
+# 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.
+
+source_set("reading_list") {
+  sources = [
+    "reading_list_download_service.cc",
+    "reading_list_download_service.h",
+    "reading_list_download_service_factory.cc",
+    "reading_list_download_service_factory.h",
+    "reading_list_entry.cc",
+    "reading_list_entry.h",
+    "reading_list_model.cc",
+    "reading_list_model.h",
+    "reading_list_model_bridge_observer.h",
+    "reading_list_model_bridge_observer.mm",
+    "reading_list_model_factory.cc",
+    "reading_list_model_factory.h",
+    "reading_list_model_impl.cc",
+    "reading_list_model_impl.h",
+    "reading_list_model_observer.h",
+    "reading_list_model_storage.h",
+    "reading_list_model_storage_defaults.h",
+    "reading_list_model_storage_defaults.mm",
+    "url_downloader.cc",
+    "url_downloader.h",
+  ]
+  deps = [
+    "//base",
+    "//components/keyed_service/core",
+    "//components/keyed_service/ios",
+    "//ios/chrome/browser:browser_no_public_deps",
+    "//ios/chrome/browser/browser_state",
+    "//ios/web",
+    "//net",
+    "//url",
+  ]
+  public_deps = [
+    "//ios/chrome/browser/dom_distiller",
+  ]
+}
+
+source_set("unit_tests") {
+  testonly = true
+  sources = [
+    "reading_list_entry_unittest.cc",
+    "reading_list_model_storage_unittest.mm",
+    "reading_list_model_unittest.cc",
+    "url_downloader_unittest.cc",
+  ]
+  deps = [
+    ":reading_list",
+    "//base",
+    "//base/test:test_support",
+    "//ios/chrome/browser",
+    "//ios/chrome/browser/dom_distiller",
+    "//ios/web:test_support",
+    "//testing/gtest",
+  ]
+}