Add GN rules for forwarder2 and chromium_commands

tools/android/common/BUILD.gn

 # 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("libwebm") {
+# GYP version tools/android/common.gyp:android_tools_common
+source_set("common") {
   sources = [
-    "source/mkvmuxer.cpp",
-    "source/mkvmuxerutil.cpp",
-    "source/mkvwriter.cpp",
+    "adb_connection.cc",
+    "adb_connection.h",
+    "daemon.cc",
+    "daemon.h",
+    "net.cc",
+    "net.h",
   ]
 
-  # mkvmuxerutil.cpp redefines the _CRT_RAND_S macro. This is the only thing
-  # that blocks this target from using Chromium compiler settings.
+  include_dirs = [
+    "..",
+    "../..",
+  ]
+
   configs -= [ "//build/config/compiler:chromium_code" ]
   configs += [ "//build/config/compiler:no_chromium_code" ]
 }