Revert of Update mojo sdk to rev 8af2ccff2eee4bfca1043015abee30482a030b30

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 2b562f2cae3945a5741be7c985b5b33535b3ce74..d971b53da925464d13779e32bfec5399fb352997 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
@@ -12,6 +12,8 @@
 from mojom.generate.template_expander import UseJinja
 
 GENERATOR_PREFIX = 'dart'
+
+_HEADER_SIZE = 8
 
 _kind_to_dart_default_value = {
   mojom.BOOL:                  "false",
@@ -207,6 +209,14 @@
 def GetInterfaceResponseName(method):
   return UpperCamelCase(method.name + 'Response')
 
+def GetResponseStructFromMethod(method):
+  return generator.GetDataHeader(
+      False, generator.GetResponseStructFromMethod(method))
+
+def GetStructFromMethod(method):
+  return generator.GetDataHeader(
+      False, generator.GetStructFromMethod(method))
+
 def GetDartTrueFalse(value):
   return 'true' if value else 'false'
 
@@ -369,8 +379,9 @@
     'dart_type': DartDeclType,
     'name': GetNameForElement,
     'interface_response_name': GetInterfaceResponseName,
-    'response_struct_from_method': generator.GetResponseStructFromMethod,
-    'struct_from_method': generator.GetStructFromMethod,
+    'response_struct_from_method': GetResponseStructFromMethod,
+    'struct_from_method': GetStructFromMethod,
+    'struct_size': lambda ps: ps.GetTotalSize() + _HEADER_SIZE,
   }
 
   def GetParameters(self):