Make SchemaLoader independent of current working directory.

tools/json_schema_compiler/compiler.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.
 """Generator for C++ structs from api json files.
 
 The purpose of this tool is to remove the need for hand-written code that
 converts to and from base::Value types when receiving javascript api calls.
 Originally written for generating code for extension apis. Reference schemas
 are in chrome/common/extensions/api.
@@ skipping 20 matching lines @@
 # Names of supported code generators, as specified on the command-line.
 # First is default.
 GENERATORS = ['cpp', 'cpp-bundle', 'dart']
 
 def GenerateSchema(generator,
                    filenames,
                    root,
                    destdir,
                    root_namespace,
                    dart_overrides_dir):
-  schema_loader = SchemaLoader(os.path.dirname(os.path.relpath(
+  schema_loader = SchemaLoader(root, os.path.dirname(os.path.relpath(
       os.path.normpath(filenames[0]), root)))
   # Merge the source files into a single list of schemas.
   api_defs = []
   for filename in filenames:
     schema = os.path.normpath(filename)
     schema_filename, schema_extension = os.path.splitext(schema)
     path, short_filename = os.path.split(schema_filename)
-    api_def = schema_loader.LoadSchema(schema)
+    api_def = schema_loader.LoadSchema(short_filename + schema_extension)
 
     # If compiling the C++ model code, delete 'nocompile' nodes.
     if generator == 'cpp':
       api_def = json_schema.DeleteNodes(api_def, 'nocompile')
     api_defs.extend(api_def)
 
   api_model = Model()
 
   # For single-schema compilation make sure that the first (i.e. only) schema
   # is the default one.
@@ skipping 87 matching lines @@
   # Unless in bundle mode, only one file should be specified.
   if opts.generator != 'cpp-bundle' and len(filenames) > 1:
     # TODO(sashab): Could also just use filenames[0] here and not complain.
     raise Exception(
         "Unless in bundle mode, only one file can be specified at a time.")
 
   result = GenerateSchema(opts.generator, filenames, opts.root, opts.destdir,
                           opts.namespace, opts.dart_overrides_dir)
   if not opts.destdir:
     print result