Reland: Introduce the devices Mojo app

device/devices_app/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.
+
+import("//mojo/public/mojo_application.gni")
+
+source_set("lib") {
+  sources = [
+    "devices_app.cc",
+    "devices_app.h",
+    "usb/device_impl.cc",
+    "usb/device_impl.h",
+    "usb/device_manager_impl.cc",
+    "usb/device_manager_impl.h",
+    "usb/type_converters.cc",
+    "usb/type_converters.h",
+  ]
+
+  deps = [
+    "//device/core",
+    "//device/devices_app/usb/public/cpp",
+    "//device/devices_app/usb/public/interfaces",
+    "//device/usb",
+    "//net",
+    "//third_party/mojo/src/mojo/public/cpp/bindings",
+    "//third_party/mojo/src/mojo/public/cpp/bindings:callback",
+    "//url",
+  ]
+
+  public_deps = [
+    "//base",
+    "//mojo/application/public/cpp",
+    "//mojo/application/public/interfaces",
+  ]
+}
+
+mojo_native_application("devices") {
+  sources = [
+    "main.cc",
+  ]
+
+  deps = [
+    ":lib",
+    "//base",
+    "//mojo/application/public/cpp",
+  ]
+
+  public_deps = [
+    ":lib",
+  ]
+}
+
+mojo_native_application("apptests") {
+  output_name = "devices_apptests"
+
+  testonly = true
+
+  sources = [
+    "devices_apptest.cc",
+  ]
+
+  deps = [
+    "//base",
+    "//mojo/application/public/cpp:test_support",
+  ]
+
+  public_deps = [
+    ":lib",
+    "//device/devices_app/usb/public/interfaces",
+  ]
+
+  data_deps = [ ":devices" ]
+}