Add "platforms" key in IDL schema compiler.

tools/json_schema_compiler/idl_schema_test.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.
 
 import idl_schema
 import unittest
 
 def getFunction(schema, name):
   for item in schema['functions']:
@@ skipping 90 matching lines @@
     enum_with_nodoc = getType(schema, 'EnumTypeWithNoDoc')
     self.assertTrue(enum_with_nodoc is not None)
     self.assertTrue(enum_with_nodoc['nodoc'])
 
   def testInternalNamespace(self):
     idl_basics  = self.idl_basics
     self.assertEquals('idl_basics', idl_basics['namespace'])
     self.assertTrue(idl_basics['internal'])
     self.assertFalse(idl_basics['nodoc'])
 
+  def testChromeOSPlatformsNamespace(self):
+    schema = idl_schema.Load('test/idl_namespace_chromeos.idl')[0]
+    self.assertEquals('idl_namespace_chromeos', schema['namespace'])
+    expected = ['chromeos']
+    self.assertEquals(expected, schema['platforms'])
+
+  def testAllPlatformsNamespace(self):
+    schema = idl_schema.Load('test/idl_namespace_all_platforms.idl')[0]
+    self.assertEquals('idl_namespace_all_platforms', schema['namespace'])
+    expected = ['chromeos', 'chromeos_touch', 'linux', 'mac', 'win']
+    self.assertEquals(expected, schema['platforms'])
+
+  def testNonSpecificPlatformsNamespace(self):
+    schema = idl_schema.Load('test/idl_namespace_non_specific_platforms.idl')[0]
+    self.assertEquals('idl_namespace_non_specific_platforms',
+                      schema['namespace'])
+    expected = None
+    self.assertEquals(expected, schema['platforms'])
+
   def testCallbackComment(self):
     schema = self.idl_basics
     self.assertEquals('A comment on a callback.',
                       getParams(schema, 'function16')[0]['description'])
     self.assertEquals(
         'A parameter.',
         getParams(schema, 'function16')[0]['parameters'][0]['description'])
     self.assertEquals(
         'Just a parameter comment, with no comment on the callback.',
         getParams(schema, 'function17')[0]['parameters'][0]['description'])
@@ skipping 33 matching lines @@
     mytype = getType(schema, 'MyType')
     self.assertEquals('string', mytype['properties']['interface']['type'])
 
     params = getParams(schema, 'static')
     self.assertEquals('Foo', params[0]['$ref'])
     self.assertEquals('enum', params[1]['$ref'])
 
 
 if __name__ == '__main__':
   unittest.main()