Add a 'tools' list to 'scons_settings' so we'll still get the

necessary 'chromium_builders' module when GYP gets updated to
use a more generic default.
BUG=none
TEST=none
Review URL: http://codereview.chromium.org/164216

git-svn-id: http://src.chromium.org/svn/trunk/src/build@22892 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

common.gypi

@@ -722,6 +722,7 @@
   ],
   'scons_settings': {
     'sconsbuild_dir': '<(DEPTH)/sconsbuild',
+    'tools': ['ar', 'as', 'gcc', 'g++', 'gnulink', 'chromium_builders'],
   },
   'xcode_settings': {
     # The Xcode generator will look for an xcode_settings section at the root