Update mojo sdk to rev bdbb0c7e396fc4044a8b194058d7a7e529715286

third_party/mojo/src/mojo/public/tools/bindings/generators/mojom_dart_generator.py

Index: third_party/mojo/src/mojo/public/tools/bindings/generators/mojom_dart_generator.py
diff --git a/third_party/mojo/src/mojo/public/tools/bindings/generators/mojom_dart_generator.py b/third_party/mojo/src/mojo/public/tools/bindings/generators/mojom_dart_generator.py
index 11e300cfadf99734e698ab6fe4e19eb2c3937a36..8c9a368a17fc8de65b98311a56dffecd267aca28 100644
--- a/third_party/mojo/src/mojo/public/tools/bindings/generators/mojom_dart_generator.py
+++ b/third_party/mojo/src/mojo/public/tools/bindings/generators/mojom_dart_generator.py
@@ -136,6 +136,8 @@ def DartDefaultValue(field):
     return _kind_to_dart_default_value[field.kind]
   if mojom.IsStructKind(field.kind):
     return "null"
+  if mojom.IsUnionKind(field.kind):
+    return "null"
   if mojom.IsArrayKind(field.kind):
     return "null"
   if mojom.IsMapKind(field.kind):
@@ -149,8 +151,10 @@ def DartDefaultValue(field):
 def DartDeclType(kind):
   if kind in mojom.PRIMITIVES:
     return _kind_to_dart_decl_type[kind]
-  if mojom.IsStructKind(kind) or mojom.IsUnionKind(kind):
+  if mojom.IsStructKind(kind):
     return GetDartType(kind)
+  if mojom.IsUnionKind(kind):
+    return "%sWrapper" % GetDartType(kind)
   if mojom.IsArrayKind(kind):
     array_type = DartDeclType(kind.kind)
     return "List<" + array_type + ">"
@@ -189,6 +193,9 @@ def ConstantStyle(name):
     components[0] = '_' + components[0]
   return '_'.join([x.upper() for x in components])
 
+def DotToUnderscore(name):
+    return name.replace('.', '_')
+
 def GetNameForElement(element):
   if (mojom.IsEnumKind(element) or mojom.IsInterfaceKind(element) or
       mojom.IsStructKind(element) or mojom.IsUnionKind(element)):
@@ -197,8 +204,10 @@ def GetNameForElement(element):
     return GetNameForElement(element.kind)
   if isinstance(element, (mojom.Method,
                           mojom.Parameter,
-                          mojom.Field)):
+                          mojom.StructField)):
     return CamelCase(element.name)
+  if isinstance(element, mojom.UnionField):
+    return "f%s" % UpperCamelCase(element.name)
   if isinstance(element, mojom.EnumValue):
     return (GetNameForElement(element.enum) + '.' +
             ConstantStyle(element.name))
@@ -208,6 +217,12 @@ def GetNameForElement(element):
     return ConstantStyle(element.name)
   raise Exception('Unexpected element: %s' % element)
 
+def GetUnionFieldTagName(element):
+  if not isinstance(element, mojom.UnionField):
+    raise Exception('Unexpected element: %s is not a union field.' % element)
+
+  return 'tag%s' % UpperCamelCase(element.name)
+
 def GetInterfaceResponseName(method):
   return UpperCamelCase(method.name + 'Response')
 
@@ -381,7 +396,9 @@ class Generator(generator.Generator):
     'dart_true_false': GetDartTrueFalse,
     'dart_type': DartDeclType,
     'name': GetNameForElement,
+    'tag_name': GetUnionFieldTagName,
     'interface_response_name': GetInterfaceResponseName,
+    'dot_to_underscore': DotToUnderscore,
   }
 
   def GetParameters(self, args):
@@ -392,6 +409,7 @@ class Generator(generator.Generator):
       "enums": self.module.enums,
       "module": resolver.ResolveConstants(self.module, ExpressionToText),
       "structs": self.GetStructs() + self.GetStructsFromMethods(),
+      "unions": self.GetUnions(),
       "interfaces": self.GetInterfaces(),
       "imported_interfaces": self.GetImportedInterfaces(),
       "imported_from": self.ImportedFrom(),