go/bindings: update code to pass structs versions tests

mojo/public/tools/bindings/generators/mojom_go_generator.py

 # Copyright 2015 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.
 
 '''Generates Go source files from a mojom.Module.'''
 
 from itertools import chain
 import os
 import re
 
@@ skipping 241 matching lines @@
 def GetImports(module):
   # Imports can only be used in structs, constants, enums, interfaces.
   all_structs = list(module.structs)
   for i in module.interfaces:
     for method in i.methods:
       all_structs.append(GetStructFromMethod(method))
       if method.response_parameters:
         all_structs.append(GetResponseStructFromMethod(method))
 
   if len(all_structs) > 0 or len(module.interfaces) > 0:
+    _imports['fmt'] = 'fmt'
     _imports['mojo/public/go/bindings'] = 'bindings'
+  if len(all_structs) > 0:
+    _imports['sort'] = 'sort'
+
   for struct in all_structs:
     for field in struct.fields:
       AddImport(module, field.kind)
 # TODO(rogulenko): add these after generating constants and struct defaults.
 #      if field.default:
 #        AddImport(module, field.default)
 
   for enum in GetAllEnums(module):
     for field in enum.fields:
       if field.value:
@@ skipping 56 matching lines @@
     return {
       'lstrip_blocks': True,
       'trim_blocks': True,
     }
 
   def GetGlobals(self):
     return {
       'namespace': self.module.namespace,
       'module': self.module,
     }