Provide defines as local variables in if-expressions.

grit/format/resource_map_unittest.py

 #!/usr/bin/env python
 # 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.
 
 '''Unit tests for grit.format.resource_map'''
 
 import os
 import sys
 if __name__ == '__main__':
@@ skipping 91 matching lines @@
         <outputs>
           <output type="rc_header" filename="the_rc_header.h" />
           <output type="resource_map_header" filename="the_rc_map_header.h" />
           <output type="resource_map_source" filename="the_rc_map_source.cc" />
         </outputs>
         <release seq="1" allow_pseudo="false">
           <messages fallback_to_english="true">
             <message name="IDS_PRODUCT_NAME" desc="The application name">
               Application
             </message>
-            <if expr="1">
+            <if expr="True">

[newt (away), 2014/02/07 17:33:42]

This test was failing since I added an assert that if-expressions must evaluate
to a boolean. Rationale: expr="chromium_build" should fail if chromium_build is
a string, e.g. "chromium" or "chrome"... in which case implicit conversion to a
boolean is probably not what the user intended.

               <message name="IDS_DEFAULT_TAB_TITLE_TITLE_CASE"
                   desc="In Title Case: The default title in a tab.">
                 New Tab
               </message>
             </if>
-            <if expr="0">
+            <if expr="False">
               <message name="IDS_DEFAULT_TAB_TITLE"
                   desc="The default title in a tab.">
                 New tab
               </message>
             </if>
           </messages>
         </release>
       </grit>'''), util.PathFromRoot('.'))
     grd.SetOutputLanguage('en')
     grd.RunGatherers()
@@ skipping 18 matching lines @@
 #include "the_rc_header.h"
 const GritResourceMap kTheRcHeader[] = {
   {"IDS_PRODUCT_NAME", IDS_PRODUCT_NAME},
   {"IDS_DEFAULT_TAB_TITLE_TITLE_CASE", IDS_DEFAULT_TAB_TITLE_TITLE_CASE},
 };
 const size_t kTheRcHeaderSize = arraysize(kTheRcHeader);''', output)
 
 
 if __name__ == '__main__':
   unittest.main()