mash: Cleanly exit on SIGTERM, SIGINT, SIGHUP

chrome/app/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/ui.gni")
 import("//chrome/common/features.gni")
 import("//ppapi/features/features.gni")
 import("//printing/features/features.gni")
 import("//services/catalog/public/tools/catalog.gni")
 import("//services/service_manager/public/service_manifest.gni")
 import("//tools/grit/grit_rule.gni")
 
 # This target is for dependency tracking for the command ID header.
 source_set("command_ids") {
   sources = [
     "chrome_command_ids.h",
   ]
 }
 
+# Shared by //chrome/browser and //chrome/app/mash. Not in //chrome/common
+# because it isn't shared with processes like renderer, utility, etc.

[James Cook, 2017/03/01 18:24:38]

I ran this by sky@ -- there's not a great place for this code to live, but this
seems like the least bad.

+source_set("shutdown_signal_handlers") {
+  sources = [
+    "shutdown_signal_handlers_posix.cc",
+    "shutdown_signal_handlers_posix.h",
+  ]
+  deps = [
+    "//base",
+  ]
+}
+
 # On Windows, links chrome_dll.rc. On other platforms, does nothing so you can
 # unconditionally depend on it.
 source_set("chrome_dll_resources") {
   # This source is added unconditionally for include checking on non-Windows
   # platforms.
   sources = [
     "chrome_dll_resource.h",
   ]
   if (is_win) {
     sources += [ "chrome_dll.rc" ]
@@ skipping 454 matching lines @@
           chrome_embedded_services +
           [ ":chrome_content_packaged_services_manifest_for_mash" ]
     }
   }
 
   catalog("catalog") {
     embedded_services = chrome_embedded_services +
                         [ ":chrome_content_packaged_services_manifest" ]
   }
 }