[mojo] Add typemap and variant support to generators

mojo/public/tools/bindings/generators/mojom_java_generator.py

 # Copyright 2014 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.
 
 """Generates java source files from a mojom.Module."""
 
 import argparse
 import ast
 import contextlib
 import os
@@ skipping 485 matching lines @@
       self.Write(self.GenerateInterfaceSource(interface),
                  '%s.java' % GetNameForElement(interface))
       self.Write(self.GenerateInterfaceInternalSource(interface),
                  '%s_Internal.java' % GetNameForElement(interface))
 
     if self.module.constants:
       self.Write(self.GenerateConstantsSource(self.module),
                  '%s.java' % GetConstantsMainEntityName(self.module))
 
   def GenerateFiles(self, unparsed_args):
+    # TODO(rockot): Support variant output for Java.
+    if self.variant:
+      raise Exception("Variants not supported in Java bindings.")
+
     parser = argparse.ArgumentParser()
     parser.add_argument('--java_output_directory', dest='java_output_directory')
     args = parser.parse_args(unparsed_args)
     package_path = GetPackage(self.module).replace('.', '/')
 
     # Generate the java files in a temporary directory and place a single
     # srcjar in the output directory.
     basename = self.MatchMojomFilePath("%s.srcjar" % self.module.name)
     zip_filename = os.path.join(self.output_dir, basename)
     with TempDir() as temp_java_root:
@@ skipping 10 matching lines @@
     return {
       'lstrip_blocks': True,
       'trim_blocks': True,
     }
 
   def GetGlobals(self):
     return {
       'namespace': self.module.namespace,
       'module': self.module,
     }