extensions: Add GN version of extensions_shell_and_test_pak and unittests target.

device/hid/BUILD.gn

Index: device/hid/BUILD.gn
diff --git a/device/hid/BUILD.gn b/device/hid/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..edd3ecbc6307bcbc2745436974a8258fa4a8dbac
--- /dev/null
+++ b/device/hid/BUILD.gn
@@ -0,0 +1,53 @@
+# 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.
+
+source_set("hid") {
+  sources = [
+    "device_monitor_linux.cc",
+    "device_monitor_linux.h",
+    "hid_collection_info.cc",
+    "hid_collection_info.h",
+    "hid_connection.cc",
+    "hid_connection.h",
+    "hid_connection_linux.cc",
+    "hid_connection_linux.h",
+    "hid_connection_mac.cc",
+    "hid_connection_mac.h",
+    "hid_connection_win.cc",
+    "hid_connection_win.h",
+    "hid_device_info.cc",
+    "hid_device_info.h",
+    "hid_report_descriptor.cc",
+    "hid_report_descriptor.h",
+    "hid_report_descriptor_item.cc",
+    "hid_report_descriptor_item.h",
+    "hid_service.cc",
+    "hid_service.h",
+    "hid_service_linux.cc",
+    "hid_service_linux.h",
+    "hid_service_mac.cc",
+    "hid_service_mac.h",
+    "hid_service_win.cc",
+    "hid_service_win.h",
+    "hid_usage_and_page.cc",
+    "hid_usage_and_page.h",
+    "input_service_linux.cc",
+    "input_service_linux.h",
+  ]
+
+  deps = [
+    "//base",
+    "//net",
+  ]
+
+  if (is_linux) {
+    configs += [
+      "//build/config/linux:udev"
+    ]
+
+    deps += [
+      "//device/udev_linux",
+    ]
+  }
+}