Mojo: Add support for constants to the IDL compiler.

mojo/public/tools/bindings/pylib/mojom/parse/translate.py

Index: mojo/public/tools/bindings/pylib/mojom/parse/translate.py
diff --git a/mojo/public/tools/bindings/pylib/mojom/parse/translate.py b/mojo/public/tools/bindings/pylib/mojom/parse/translate.py
index 2300cb6f0381da79efca73960eae00f5b59a3725..e43cfd52243a5a633dfaad546d2ff3d11f39b2c5 100644
--- a/mojo/public/tools/bindings/pylib/mojom/parse/translate.py
+++ b/mojo/public/tools/bindings/pylib/mojom/parse/translate.py
@@ -83,6 +83,7 @@ def _MapStruct(tree):
   struct['attributes'] = _MapAttributes(tree[2])
   struct['fields'] = _MapTree(_MapField, tree[3], 'FIELD')
   struct['enums'] = _MapTree(_MapEnum, tree[3], 'ENUM')
+  struct['constants'] = _MapTree(_MapConstant, tree[3], 'CONST')
   return struct
 
 def _MapInterface(tree):
@@ -91,6 +92,7 @@ def _MapInterface(tree):
   interface['peer'] = _GetAttribute(tree[2], 'Peer')
   interface['methods'] = _MapTree(_MapMethod, tree[3], 'METHOD')
   interface['enums'] = _MapTree(_MapEnum, tree[3], 'ENUM')
+  interface['constants'] = _MapTree(_MapConstant, tree[3], 'CONST')
   return interface
 
 def _MapEnum(tree):
@@ -99,6 +101,13 @@ def _MapEnum(tree):
   enum['fields'] = _MapTree(_MapEnumField, tree[2], 'ENUM_FIELD')
   return enum
 
+def _MapConstant(tree):
+  constant = {}
+  constant['name'] = tree[2]
+  constant['kind'] = _MapKind(tree[1])
+  constant['value'] = tree[3]
+  return constant
+
 def _MapModule(tree, name):
   mojom = {}
   mojom['name'] = name
@@ -107,6 +116,7 @@ def _MapModule(tree, name):
   mojom['structs'] = _MapTree(_MapStruct, tree[3], 'STRUCT')
   mojom['interfaces'] = _MapTree(_MapInterface, tree[3], 'INTERFACE')
   mojom['enums'] = _MapTree(_MapEnum, tree[3], 'ENUM')
+  mojom['constants'] = _MapTree(_MapConstant, tree[3], 'CONST')
   return mojom
 
 def _MapImport(tree):