Make unit_tests pass with pt_BR.UTF-8 locale.

third_party/dmg_fp/dmg_fp.scons

Index: third_party/dmg_fp/dmg_fp.scons
===================================================================
--- third_party/dmg_fp/dmg_fp.scons	(revision 0)
+++ third_party/dmg_fp/dmg_fp.scons	(revision 0)
@@ -0,0 +1,45 @@
+# Copyright (c) 2008 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('env')
+
+env = env.Clone()
+
+# Do *NOT* define USE_LOCALE here. We want these functions to be
+# locale-independent, for example to use in parsers or serializers.
+env.Append(
+    # TODO(sgk): Review this when we want to support more architectures.
+    CPPDEFINES = [
+        'IEEE_8087',
+    ],
+)
+
+if env['PLATFORM'] == 'win32':
+  env.Append(
+      CCFLAGS = [
+          '/TC',
+
+          '/wd4800',
+          '/wd4244',
+      ],
+  )
+
+if env['PLATFORM'] in ('darwin', 'posix'):
+  # As usual with third party code, it generates lots of warnings.
+  # Disable only what's necessary.
+  env.Append(
+      CCFLAGS = [
+          '-Wno-parentheses',
+          '-Wno-sign-compare',
+          '-Wno-unused-label',
+          '-Wno-write-strings',
+      ]
+  )
+
+input_files = [
+    'dtoa.cc',
+    'g_fmt.cc',
+]
+
+env.ChromeStaticLibrary('dmg_fp', input_files)