Fix placeholder syntax for Chrome extensions.

grit/format/chrome_messages_json_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.
 
 """Unittest for chrome_messages_json.py.
 """
 
 import os
 import sys
@@ skipping 14 matching lines @@
     <messages>
       <message name="IDS_SIMPLE_MESSAGE">
               Simple message.
       </message>
       <message name="IDS_QUOTES">
               element\u2019s \u201c<ph name="NAME">%s<ex>name</ex></ph>\u201d attribute
       </message>
       <message name="IDS_PLACEHOLDERS">
               <ph name="ERROR_COUNT">%1$d<ex>1</ex></ph> error, <ph name="WARNING_COUNT">%2$d<ex>1</ex></ph> warning
       </message>
+      <message name="IDS_PLACEHOLDERS_SUBSTITUTED_BY_GETMESSAGE">
+              <ph name="BEGIN">$1<ex>a</ex></ph>test<ph name="END">$2<ex>b</ex></ph>
+      </message>
       <message name="IDS_STARTS_WITH_SPACE">
               ''' (<ph name="COUNT">%d<ex>2</ex></ph>)
       </message>
       <message name="IDS_ENDS_WITH_SPACE">
               (<ph name="COUNT">%d<ex>2</ex></ph>) '''
       </message>
       <message name="IDS_SPACE_AT_BOTH_ENDS">
               ''' (<ph name="COUNT">%d<ex>2</ex></ph>) '''
       </message>
       <message name="IDS_DOUBLE_QUOTES">
@@ skipping 12 matching lines @@
 {
   "SIMPLE_MESSAGE": {
     "message": "Simple message."
   },
   "QUOTES": {
     "message": "element\\u2019s \\u201c%s\\u201d attribute"
   },
   "PLACEHOLDERS": {
     "message": "%1$d error, %2$d warning"
   },
+  "PLACEHOLDERS_SUBSTITUTED_BY_GETMESSAGE": {
+    "message": "$1$test$2$",
+    "placeholders": {
+      "1": {
+        "content": "$1"
+      },
+      "2": {
+        "content": "$2"
+      }
+    }
+  },
   "STARTS_WITH_SPACE": {
     "message": " (%d)"
   },
   "ENDS_WITH_SPACE": {
     "message": "(%d) "
   },
   "SPACE_AT_BOTH_ENDS": {
     "message": " (%d) "
   },
   "DOUBLE_QUOTES": {
@@ skipping 42 matching lines @@
 
   def GetLanguage(self):
     return self.language
 
   def GetOutputFilename(self):
     return 'hello.gif'
 
 
 if __name__ == '__main__':
   unittest.main()