Introduce a mock ui_unittests Framework for loading resources.

ui/ui_unittests.gyp

Index: ui/ui_unittests.gyp
diff --git a/ui/ui_unittests.gyp b/ui/ui_unittests.gyp
index 244cad345d79e660c7096b936a099e5be7df1a62..aa5a38a4d1bd611c653a9ef7cd8cfb56db181d3c 100644
--- a/ui/ui_unittests.gyp
+++ b/ui/ui_unittests.gyp
@@ -59,12 +59,24 @@
       ],
     },
     {
+      'target_name': 'ui_test_dll',
+      'type': 'none',
+      'dependencies': [
+        'resources/ui_resources.gyp:ui_test_pak',
+      ],
+      'conditions': [
+        ['OS=="mac"', {
+          'type': 'shared_library',
+          'includes': [ 'ui_unittests_bundle.gypi' ],
+        }],
+      ],
+    },
+    {
       'target_name': 'ui_unittests',
       'type': '<(gtest_target_type)',
       'dependencies': [
         '../base/base.gyp:base',
         '../base/base.gyp:test_support_base',
-        '../chrome/chrome_resources.gyp:packed_resources',
         '../skia/skia.gyp:skia',
         '../testing/gmock.gyp:gmock',
         '../testing/gtest.gyp:gtest',
@@ -79,6 +91,7 @@
         'resources/ui_resources.gyp:ui_resources',
         'shell_dialogs/shell_dialogs.gyp:shell_dialogs',
         'ui.gyp:ui',
+        'ui_test_dll',
         'ui_test_support',
       ],
       # iOS uses a small subset of ui. common_sources are the only files that