Roll src/tools/gyp/ to 29e94a3285ee899d14d5e56a6001682620d3778f.

build/gyp_chromium

Index: build/gyp_chromium
diff --git a/build/gyp_chromium b/build/gyp_chromium
index 335df1ccb223cefa68b41e8f95497f97f84506b8..704b5610b30e198df924fa76acb8cfa2acc28b70 100755
--- a/build/gyp_chromium
+++ b/build/gyp_chromium
@@ -261,6 +261,14 @@ if __name__ == '__main__':
   if gyp_vars_dict.get('OS') != 'ios':
     args.append('--no-circular-check')
 
+  # libtool on Mac warns about duplicate basenames in static libraries, so
+  # they're disallowed in general by gyp. We are lax on this point, so disable
+  # this check other than on Mac. GN does not use static libraries as heavily,
+  # so over time this restriction will mostly go away anyway, even on Mac.
+  # https://code.google.com/p/gyp/issues/detail?id=384
+  if sys.platform != 'darwin':
+    args.append('--no-duplicate-basename-check')
+
   # We explicitly don't support the make gyp generator (crbug.com/348686). Be
   # nice and fail here, rather than choking in gyp.
   if re.search(r'(^|,|\s)make($|,|\s)', os.environ.get('GYP_GENERATORS', '')):