Add Linux build packaging targets to GN

chrome/installer/BUILD.gn

Index: chrome/installer/BUILD.gn
diff --git a/chrome/installer/BUILD.gn b/chrome/installer/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..5b0b9f4a521077e4d642355476e5152884e2a1fc
--- /dev/null
+++ b/chrome/installer/BUILD.gn
@@ -0,0 +1,14 @@
+# 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("//build/config/chrome_build.gni")
+
+# Meta-target that forwards to the installer of the correct type (if any).
+group("installer") {
+  if (is_linux && is_chrome_branded) {
+    deps = [
+      "//chrome/installer/linux",
+    ]
+  }
+}