Add "platforms" key in IDL schema compiler.

tools/json_schema_compiler/test/idl_namespace_non_specific_platforms.idl

Index: tools/json_schema_compiler/test/idl_namespace_non_specific_platforms.idl
diff --git a/chrome/test/functional/perf/endure_graphs/config.js b/tools/json_schema_compiler/test/idl_namespace_non_specific_platforms.idl
similarity index 58%
copy from chrome/test/functional/perf/endure_graphs/config.js
copy to tools/json_schema_compiler/test/idl_namespace_non_specific_platforms.idl
index cb9fa3d90b699b35fc244cd73d8859afcd80bee9..05162f4a08ddb52eb186ecd483296e15134c2494 100644
--- a/chrome/test/functional/perf/endure_graphs/config.js
+++ b/tools/json_schema_compiler/test/idl_namespace_non_specific_platforms.idl
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-var Config = {
-  buildslave: 'Chrome Endure Bots',
-  title: 'Chrome Endure Tests',
+// Tests the case of a namespace with non specific platforms.
+
+namespace idl_namespace_non_specific_platforms {
+
 };