Add simple mash context menu support.

chrome/browser/chromeos/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.
 
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//chrome/chrome_tests.gni")
 import("//media/media_options.gni")
 import("//third_party/protobuf/proto_library.gni")
 
@@ skipping 68 matching lines @@
     # be generated before code in this target can start building.
     "//components/resources",
     "//components/strings",
     "//components/variations",
     "//content/public/browser",
     "//content/public/common",
     "//crypto",
     "//dbus",
     "//device/bluetooth",
     "//device/hid",
+    "//mash/shelf/public/interfaces",
     "//media",
     "//media/mojo/interfaces",
     "//mojo/common",
     "//mojo/shell/public/cpp",
     "//net",
     "//ppapi/proxy:ipc",  # For PpapiMsg_LoadPlugin
 
     # TODO: care about enable_basic_printing and enable_print_preview.
     "//printing",
     "//skia",
@@ skipping 109 matching lines @@
     "policy/proto/install_attributes.proto",
   ]
 }
 
 proto_library("attestation_proto") {
   sources = [
     "attestation/attestation_key_payload.proto",
     "attestation/attestation_signed_data.proto",
   ]
 }