Fix bug whereby booleans in unions could not be serialized in python.

mojo/public/python/mojo_bindings/descriptor.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.
 
 """
 The descriptors used to define generated elements of the mojo python bindings.
 """
 
 import array
 import itertools
@@ skipping 84 matching lines @@
              corresponds to the first element in the tuple returned by
              Serialize.
       data: the bytearray to retrieve additional data from.
       handles: the array of handles contained in the message to deserialize.
 
     Returns the deserialized value.
     """
     raise NotImplementedError()
 
 
-class BooleanType(Type):
+class BooleanType(SerializableType):
   """Type object for booleans"""
 
   def Convert(self, value):
     return bool(value)
 
+  def Serialize(self, value, data_offset, data, handle_offset):
+    return (_ConvertBooleansToByte([value]), [])
+
+  def Deserialize(self, value, context):
+    return _ConvertByteToBooleans(value)[0]
+
 
 class NumericType(SerializableType):
   """Base Type object for all numeric types"""
 
   def GetDefaultValue(self, value):
     if value is None:
       return self.Convert(0)
     return self.Convert(value)
 
   def Serialize(self, value, data_offset, data, handle_offset):
@@ skipping 508 matching lines @@
     return None
 
   @staticmethod
   def _GetArrayType(t):
     if t == TYPE_BOOL:
       return BooleanArrayType()
     else:
       return GenericArrayType(t)
 
 
-TYPE_BOOL = BooleanType()
+TYPE_BOOL = BooleanType('B')
 
 TYPE_INT8 = IntegerType('b')
 TYPE_INT16 = IntegerType('h')
 TYPE_INT32 = IntegerType('i')
 TYPE_INT64 = IntegerType('q')
 
 TYPE_UINT8 = IntegerType('B')
 TYPE_UINT16 = IntegerType('H')
 TYPE_UINT32 = IntegerType('I')
 TYPE_UINT64 = IntegerType('Q')
@@ skipping 150 matching lines @@
 
 
 def _ConvertByteToBooleans(value, min_size=0):
   """Unpack an integer into a list of booleans."""
   res = []
   while value:
     res.append(bool(value&1))
     value = value / 2
   res.extend([False] * (min_size - len(res)))
   return res