Add support for constants in the new go generator.

mojom/generators/go/translator/mojom_file.go

 // Copyright 2016 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.
 
 package translator
 
 import (
         "fmt"
         "strings"
 )
 
 // TmplFile contains all of the information needed by the templates to generate
 // the go bindings for one mojom file.
 type TmplFile struct {
         PackageName               string
         Imports                   []Import
         Structs                   []*StructTemplate
         Unions                    []*UnionTemplate
         Enums                     []*EnumTemplate
         Interfaces                []*InterfaceTemplate
+  Constants                 []*ConstantTemplate

[vardhan, 2016/08/15 22:51:59]

tabs

[azani, 2016/08/15 23:49:39]

Done.

         MojomImports              []string
         SerializedRuntimeTypeInfo string
 }
 
 type Import struct {
         PackagePath string
         PackageName string
 }
 
 func (t *TmplFile) TypesPkg() string {
@@ skipping 184 matching lines @@
 
         // ResponseParams of the method.
         ResponseParams *StructTemplate
 
         // Interface is the interface that contains this method.
         Interface *InterfaceTemplate
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 
+type ConstantTemplate struct {
+  Name string
+

[vardhan, 2016/08/15 22:51:59]

empty spaces not necessary if there are no comments?

[azani, 2016/08/15 23:49:39]

Done.

+  Type string
+
+  Value string
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
 // EncodingInfo describes the information necessary to encode a field.
 type EncodingInfo interface {
         // IsSimple returns true if the field is a numeric type, boolean or string.
         IsSimple() bool
 
         // IsHandle returns true if the field is a handle type.
         IsHandle() bool
 
         // IsPointer returns true if the field is a pointer: struct, array, map or string.
         IsPointer() bool
@@ skipping 454 matching lines @@
         }
 }
 
 func (t *interfaceTypeEncodingInfo) ReadFunction() string {
         if t.interfaceRequest {
                 return "ReadMessagePipeHandle"
         } else {
                 return "ReadInterface"
         }
 }