Add a new FORCE_DETERMINISTIC_BUILD define.

build/config/BUILD.gn

 # Copyright (c) 2013 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/allocator.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 
 declare_args() {
   # When set, turns off the (normally-on) iterator debugging and related stuff
   # that is normally turned on for Debug builds. These are generally useful for
   # catching bugs but in some cases may cause conflicts or excessive slowness.
   disable_iterator_debugging = false
+
+  # Set to true to force deterministic builds (this isn't working yet but this
+  # flag will help us to get there). See http://crbug.com/314403.
+  # TODO(sebmarchand): Update this comment once this flag guarantee a
+  #     deterministic build.
+  force_deterministic_build = false
 }
 
 # TODO(brettw) Most of these should be removed. Instead of global feature
 # flags, we should have more modular flags that apply only to a target and its
 # dependents. For example, depending on the "x11" meta-target should define
 # USE_X11 for all dependents so that everything that could use X11 gets the
 # define, but anything that doesn't depend on X11 doesn't see it.
 #
 # For now we define these globally to match the current GYP build.
 config("feature_flags") {
@@ skipping 39 matching lines @@
   }
   if (enable_printing > 0) {
     defines += [ "ENABLE_PRINTING=1" ]
     if (enable_printing < 2) {
       defines += [ "ENABLE_FULL_PRINTING=1" ]
     }
   }
   if (enable_spellcheck) {
     defines += [ "ENABLE_SPELLCHECK=1" ]
   }
+  if (force_deterministic_build) {
+    defines += [ "FORCE_DETERMINISTIC_BUILD" ]
+  }
   if (use_udev) {
     # TODO(brettw) should probably be "=1".
     defines += [ "USE_UDEV" ]
   }
   if (toolkit_views) {
     defines += [ "TOOLKIT_VIEWS=1" ]
   }
   if (ui_compositor_image_transport) {
     # TODO(brettw) should probably be "=1".
     defines += [ "UI_COMPOSITOR_IMAGE_TRANSPORT" ]
@@ skipping 141 matching lines @@
       "CoreText.framework",
       "Foundation.framework",
       "UIKit.framework",
     ]
   } else if (is_linux) {
     libs = [
       "dl",
     ]
   }
 }