Add support for building Xcode project files from GYP files

samples/process.cc

Index: samples/process.cc
===================================================================
--- samples/process.cc	(revision 8223)
+++ samples/process.cc	(working copy)
@@ -535,7 +535,7 @@
                   string* file) {
   for (int i = 1; i < argc; i++) {
     string arg = argv[i];
-    int index = arg.find('=', 0);
+    size_t index = arg.find('=', 0);
     if (index == string::npos) {
       *file = arg;
     } else {