[Mac] Move the lists of XIB files into a gypi file.

This creates lists of XIB files that Chromium has. It also lays the groundwork
for editing XIB files on Xcode 4.4 by creating a fake project for working in
Xcode.

BUG=149763
TEST=No changes in build output.
TBR=mark@chromium.org

Review URL: https://codereview.chromium.org/10918254

git-svn-id: http://src.chromium.org/svn/trunk/src/build@157199 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

mac/edit_xibs.sh

@@ -0,0 +1,17 @@
+#!/bin/sh
+
+# Copyright (c) 2012 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.
+
+# This script is a convenience to run GYP for /src/chrome/chrome_nibs.gyp
+# with the Xcode generator (as you likely use ninja). Documentation:
+#   http://dev.chromium.org/developers/design-documents/mac-xib-files
+
+set -e
+
+RELSRC=$(dirname "$0")/../..
+SRC=$(cd "$RELSRC" && pwd)
+GYP_GENERATORS=xcode python "$SRC/tools/gyp/gyp" "$SRC/chrome/chrome_nibs.gyp"
+echo "You can now edit XIB files in Xcode using:"
+echo "  $SRC/chrome/chrome_nibs.xcodeproj"