Fixed Mac gyp build. Switched to using Chrome hash_tables.h, changed...

tests/tests.gyp

 # Copyright (c) 2009 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'includes': [
     '../build/common.gypi',
   ],
   'target_defaults': {
     'include_dirs': [
       '..',
       '../..',
     ],
+    # TODO(rlp): remove this after fixing signed / unsigned issues in
+    # command buffer code and tests.
+    'target_conditions': [
+      ['OS == "mac"',
+        {
+          'xcode_settings': {
+            'GCC_TREAT_WARNINGS_AS_ERRORS': 'NO'
+          },
+        },
+      ],
+    ],
   },
   'targets': [
     {
       'target_name': 'unit_tests',
       'type': 'executable',
       'dependencies': [
         '../../<(antlrdir)/antlr.gyp:antlr3c',
         '../../<(fcolladadir)/fcollada.gyp:fcollada',
         '../../<(jpegdir)/libjpeg.gyp:libjpeg',
         '../../<(pngdir)/libpng.gyp:libpng',
@@ skipping 176 matching lines @@
                   '../../<(pdiffdir)/bin/linux/perceptualdiff',
                 ],
               },
             ],
           },
         ],
       ],
     },
   ],
 }