[Android] Fix gn build for instrumentation tests.

tools/android/forwarder2/BUILD.gn

Index: tools/android/forwarder2/BUILD.gn
diff --git a/tools/android/forwarder2/BUILD.gn b/tools/android/forwarder2/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..87e6abf72262c4b21daf408cceb3013fe154d292
--- /dev/null
+++ b/tools/android/forwarder2/BUILD.gn
@@ -0,0 +1,94 @@
+# 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.
+
+# GYP: //tools/android/forwarder2/forwarder.gyp:forwarder2
+group("forwarder2") {
+  datadeps = [
+    ":host_forwarder($host_toolchain)",
+    ":host_forwarder_copy($host_toolchain)",
+    ":device_forwarder($default_toolchain)",
+    ":device_forwarder_prepare_dist($default_toolchain)",
+  ]
+}
+
+if (current_toolchain == default_toolchain) {
+  import("//build/config/android/rules.gni")
+
+  # GYP: //tools/android/forwarder2/forwarder.gyp:device_forwarder
+  executable("device_forwarder") {
+    sources = [
+      "command.cc",
+      "command.h",
+      "common.cc",
+      "common.h",
+      "daemon.cc",
+      "daemon.h",
+      "device_controller.cc",
+      "device_controller.h",
+      "device_forwarder_main.cc",
+      "device_listener.cc",
+      "device_listener.h",
+      "forwarder.cc",
+      "forwarder.h",
+      "forwarders_manager.cc",
+      "forwarders_manager.h",
+      "pipe_notifier.cc",
+      "pipe_notifier.h",
+      "self_deleter_helper.h",
+      "socket.cc",
+      "socket.h",
+      "util.h",
+    ]
+    deps = [
+      "//base",
+      "//tools/android/common",
+    ]
+    datadeps = [
+      "//build/android/pylib/device/commands",
+    ]
+  }
+
+  # GYP: //tools/android/forwarder2/forwarder.gyp:forwarder2
+  create_native_executable_dist("device_forwarder_prepare_dist") {
+    dist_dir = "$root_build_dir/forwarder_dist"
+    binary = "$root_build_dir/exe.stripped/device_forwarder"
+  }
+}
+
+if (current_toolchain != default_toolchain) {
+  # GYP: //tools/android/forwarder2/forwarder.gyp:host_forwarder
+  executable("host_forwarder") {
+    sources = [
+      "command.cc",
+      "command.h",
+      "common.cc",
+      "common.h",
+      "daemon.cc",
+      "daemon.h",
+      "forwarder.cc",
+      "forwarder.h",
+      "forwarders_manager.cc",
+      "forwarders_manager.h",
+      "host_controller.cc",
+      "host_controller.h",
+      "host_forwarder_main.cc",
+      "pipe_notifier.cc",
+      "pipe_notifier.h",
+      "self_deleter_helper.h",
+      "socket.cc",
+      "socket.h",
+      "util.h",
+    ]
+    deps = [
+      "//base",
+      "//tools/android/common",
+    ]
+  }
+
+  # GYP: //tools/android/forwarder2/forwarder.gyp:forwarder2
+  copy("host_forwarder_copy") {
+    sources = ["$root_out_dir/host_forwarder"]
+    outputs = ["$root_build_dir/host_forwarder"]
+  }
+}