Adds ability for chrome to behave as mojo_runner

chrome/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/buildflag_header.gni")
 import("//build/config/chrome_build.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/config/features.gni")
 import("//build/config/locales.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 import("//build/config/ui.gni")
 import("//build/config/win/console_app.gni")
 import("//build/config/win/manifest.gni")
 import("//chrome/chrome_repack_locales.gni")
+import("//chrome/mash.gni")
 import("//chrome/version.gni")
 
 declare_args() {
   # Specify the current PGO phase, only used for the Windows MSVS build. Here's
   # the different values that can be used:
   #     0 : Means that PGO is turned off.
   #     1 : Used during the PGI (instrumentation) phase.
   #     2 : Used during the PGO (optimization) phase.
   #
   # TODO(sebmarchand): Add support for the PGU (update) phase.
@@ skipping 155 matching lines @@
 
         # Needed to use the master_preferences functions
         "//chrome/installer/util:with_no_strings",
         "//content/public/app:both",
       ]
       if (enable_plugins && enable_pdf) {
         deps += [ "//pdf" ]
       }
 
       public_deps = [
+        ":features",
         ":xdg_mime",  # Needs to be public for installer to consume files.
       ]
 
       # GYP has this in a 'profiling==0 and linux_disable_pie==0' condition.
       # but GN doesn't have either of these flags.
       ldflags = [ "-pie" ]
 
       if (use_pango || use_cairo) {
         # Needed for chrome_main.cc initialization of libraries.
         configs += [ "//build/config/linux:pangocairo" ]
       }
 
       if (use_x11) {
         configs += [
           "//build/config/linux:x11",
           "//build/config/linux:xext",
         ]
       }
+
+      if (use_mash) {

[Ben Goodger (Google), 2016/02/22 20:20:00]

you should give this variable a name that implies it's only related to the
packaging of mash components in chrome. as it stands, this variable will be
misused by people in a way that makes it impossible to test without using this
package.

I suggest "package_mash_services"

[sky, 2016/02/23 00:01:33]

I went with the wordy enable_package_mash_services.

+        deps += [ "//chrome/app/mash" ]
+      }
     }
 
     if (is_mac) {
       sources += [ "app/chrome_exe_main_mac.c" ]
       deps += [ ":chrome_dll" ]
 
       # TODO(GYP) lots more stuff in the is_mac block.
     } else {  # Non-Mac.
       # These files are used by the installer so we need a public dep.
       public_deps += [
@@ skipping 68 matching lines @@
       "app/chrome_main_delegate.cc",
       "app/chrome_main_delegate.h",
       "app/chrome_main_mac.h",
       "app/chrome_main_mac.mm",
       "app/delay_load_hook_win.cc",
       "app/delay_load_hook_win.h",
     ]
 
     deps = [
       ":browser_dependencies",
+      ":features",
       "//build/config/sanitizers:deps",
     ]
     if (is_win) {
       output_name = "chrome"
 
       deps += [
         ":chrome_dll_manifest",
         ":chrome_dll_version",
         "//base/trace_event/etw_manifest:chrome_events_win",
         "//chrome/app/theme:chrome_unscaled_resources",
@@ skipping 57 matching lines @@
       # Define the order of symbols within the framework.
       ldflags += [
         "-Wl,-order_file",
         "-Wl," + rebase_path("app/framework.order", root_build_dir),
       ]
     }
 
     if (enable_plugins && enable_pdf && !is_multi_dll_chrome) {
       deps += [ "//pdf" ]
     }
+
+    if (use_mash) {
+      deps += [ "//chrome/app/mash" ]
+    }
   }
 
   if (is_multi_dll_chrome) {
     # This manifest matches what GYP produces. It may not even be necessary.
     windows_manifest("chrome_child_manifest") {
       sources = [
         as_invoker_manifest,
       ]
       type = "dll"
     }
@@ skipping 708 matching lines @@
       "//chrome/app/theme/$branding_path_component/product_logo_48.png",
       "//chrome/tools/build/linux/chrome-wrapper",
       "//third_party/xdg-utils/scripts/xdg-mime",
       "//third_party/xdg-utils/scripts/xdg-settings",
     ]
     outputs = [
       "$root_out_dir/{{source_file_part}}",
     ]
   }
 }
+
+buildflag_header("features") {
+  header = "chrome_features.h"
+  flags = [ "USE_MASH=$use_mash" ]
+}