mojo: add handle<shared_buffer> support to generator

mojo/public/bindings/pylib/generate/mojom_pack.py

 # Copyright 2013 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 mojom
 
 # mojom_pack provides a mechanism for determining the packed order and offsets
 # of a mojom.Struct.
 #
 # ps = mojom_pack.PackedStruct(struct)
 # ps.packed_fields will access a list of PackedField objects, each of which
 # will have an offset, a size and a bit (for mojom.BOOLs).
 
 class PackedField(object):
   kind_to_size = {
-    mojom.BOOL:    1,
-    mojom.INT8:    1,
-    mojom.UINT8:   1,
-    mojom.INT16:   2,
-    mojom.UINT16:  2,
-    mojom.INT32:   4,
-    mojom.UINT32:  4,
-    mojom.FLOAT:   4,
-    mojom.HANDLE:  4,
-    mojom.MSGPIPE: 4,
-    mojom.DCPIPE:  4,
-    mojom.DPPIPE:  4,
-    mojom.INT64:   8,
-    mojom.UINT64:  8,
-    mojom.DOUBLE:  8,
-    mojom.STRING:  8
+    mojom.BOOL:         1,
+    mojom.INT8:         1,
+    mojom.UINT8:        1,
+    mojom.INT16:        2,
+    mojom.UINT16:       2,
+    mojom.INT32:        4,
+    mojom.UINT32:       4,
+    mojom.FLOAT:        4,
+    mojom.HANDLE:       4,
+    mojom.MSGPIPE:      4,
+    mojom.SHAREDBUFFER: 4,
+    mojom.DCPIPE:       4,
+    mojom.DPPIPE:       4,
+    mojom.INT64:        8,
+    mojom.UINT64:       8,
+    mojom.DOUBLE:       8,
+    mojom.STRING:       8
   }
 
   @classmethod
   def GetSizeForKind(cls, kind):
     if isinstance(kind, mojom.Array) or isinstance(kind, mojom.Struct):
       return 8
     if isinstance(kind, mojom.Interface):
       kind = mojom.MSGPIPE
     if isinstance(kind, mojom.Enum):
       # TODO(mpcomplete): what about big enums?
@@ skipping 97 matching lines @@
     limit_of_previous_field = packed_field.offset + packed_field.size
 
   for i in xrange(limit_of_previous_field, len(bytes)):
     bytes[i].is_padding = True
 
   for byte in bytes:
     # A given byte cannot both be padding and have a fields packed into it.
     assert not (byte.is_padding and byte.packed_fields)
 
   return bytes