Sync defines with the GYP build.

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/chrome_build.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//build/module_args/v8.gni")
@@ skipping 221 matching lines @@
   }
   if (safe_browsing_mode == 1) {
     defines += [ "FULL_SAFE_BROWSING" ]
     defines += [ "SAFE_BROWSING_CSD" ]
     defines += [ "SAFE_BROWSING_DB_LOCAL" ]
     defines += [ "SAFE_BROWSING_SERVICE" ]
   } else if (safe_browsing_mode == 2) {
     defines += [ "MOBILE_SAFE_BROWSING" ]
     defines += [ "SAFE_BROWSING_SERVICE" ]
   }
+  if (is_official_build) {
+    defines += [ "OFFICIAL_BUILD" ]

[Dirk Pranke, 2015/05/12 00:09:41]

Didn't you have this in a different CL somewhere?

+  }
 }
 
 # Debug/release ----------------------------------------------------------------
 
 config("debug") {
   defines = [
     "_DEBUG",
     "DYNAMIC_ANNOTATIONS_ENABLED=1",
     "WTF_USE_DYNAMIC_ANNOTATIONS=1",
   ]
@@ skipping 12 matching lines @@
              !disable_iterator_debugging) {
     # Enable libstdc++ debugging facilities to help catch problems early, see
     # http://crbug.com/65151 .
     # TODO(phajdan.jr): Should we enable this for all of POSIX?
     defines += [ "_GLIBCXX_DEBUG=1" ]
   }
 }
 
 config("release") {
   defines = [ "NDEBUG" ]
+
+  # Sanitizers.
+  # TODO(GYP) The GYP build has "release_valgrind_build == 0" for this
+  # condition. When Valgrind is set up, we need to do the same here.
+  if (!is_tsan) {
+    defines += [ "NVALGRIND" ]
+    if (!is_nacl) {
+      # NaCl always enables dynamic annotations. Currently this value is set to
+      # 1 for all .nexes.
+      defines += [ "DYNAMIC_ANNOTATIONS_ENABLED=0" ]

[Dirk Pranke, 2015/05/12 00:09:40]

I don't quite understand this comment; how is the second sentence different than
the first sentence? It's also a little weird that you're talking about what NaCl
does in the (!nacl) case. 

+    }
+  }
 }
 
 # Default libraries ------------------------------------------------------------
 
 # This config defines the default libraries applied to all targets.
 config("default_libs") {
   if (is_win) {
     # TODO(brettw) this list of defaults should probably be smaller, and
     # instead the targets that use the less common ones (e.g. wininet or
     # winspool) should include those explicitly.
@@ skipping 55 matching lines @@
       "CoreFoundation.framework",
       "CoreGraphics.framework",
       "CoreText.framework",
       "Foundation.framework",
       "UIKit.framework",
     ]
   } else if (is_linux) {
     libs = [ "dl" ]
   }
 }