IDL: Put generated union type containers in separate files

Source/bindings/templates/union_container.h

-// Copyright 2014 The Chromium Authors. All rights reserved.
+// 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.
 
 // This file has been auto-generated by {{code_generator}}. DO NOT MODIFY!
 
-#ifndef {{macro_guard}}
-#define {{macro_guard}}
+#ifndef {{cpp_class}}_h
+#define {{cpp_class}}_h
 
 {% for filename in header_includes %}
 #include "{{filename}}"
 {% endfor %}
 
 namespace blink {
 
-{% for decl in header_forward_decls %}
-class {{decl}};
-{% endfor %}
-
-{% for container in containers %}
-class {{container.cpp_class}} final {
+class {{cpp_class}} final {
     ALLOW_ONLY_INLINE_ALLOCATION();
 public:
-    {{container.cpp_class}}();
+    {{cpp_class}}();
     bool isNull() const { return m_type == SpecificTypeNone; }
 
-    {% for member in container.members %}
+    {% for member in members %}
     bool is{{member.type_name}}() const { return m_type == {{member.specific_type_enum}}; }
     {{member.rvalue_cpp_type}} getAs{{member.type_name}}() const;
     void set{{member.type_name}}({{member.rvalue_cpp_type}});
-    static {{container.cpp_class}} from{{member.type_name}}({{member.rvalue_cpp_type}});
+    static {{cpp_class}} from{{member.type_name}}({{member.rvalue_cpp_type}});
 
     {% endfor %}
-    {% if container.needs_trace %}
+    {% if needs_trace %}
     DECLARE_TRACE();
 
     {% endif %}
 private:
     enum SpecificTypes {
         SpecificTypeNone,
-        {% for member in container.members %}
+        {% for member in members %}
         {{member.specific_type_enum}},
         {% endfor %}
     };
     SpecificTypes m_type;
 
-    {% for member in container.members %}
+    {% for member in members %}
     {{member.cpp_type}} m_{{member.cpp_name}};
     {% endfor %}
 
-    friend v8::Local<v8::Value> toV8(const {{container.cpp_class}}&, v8::Local<v8::Object>, v8::Isolate*);
+    friend v8::Local<v8::Value> toV8(const {{cpp_class}}&, v8::Local<v8::Object>, v8::Isolate*);
 };
 
-class V8{{container.cpp_class}} final {
+class {{v8_class}} final {
 public:
-    static void toImpl(v8::Isolate*, v8::Local<v8::Value>, {{container.cpp_class}}&, ExceptionState&);
+    static void toImpl(v8::Isolate*, v8::Local<v8::Value>, {{cpp_class}}&, ExceptionState&);
 };
 
-v8::Local<v8::Value> toV8(const {{container.cpp_class}}&, v8::Local<v8::Object>, v8::Isolate*);
+v8::Local<v8::Value> toV8(const {{cpp_class}}&, v8::Local<v8::Object>, v8::Isolate*);
 
 template <class CallbackInfo>
-inline void v8SetReturnValue(const CallbackInfo& callbackInfo, {{container.cpp_class}}& impl)
+inline void v8SetReturnValue(const CallbackInfo& callbackInfo, {{cpp_class}}& impl)
 {
     v8SetReturnValue(callbackInfo, toV8(impl, callbackInfo.Holder(), callbackInfo.GetIsolate()));
 }
 
 template <>
-struct NativeValueTraits<{{container.cpp_class}}> {
-    static {{container.cpp_class}} nativeValue(const v8::Local<v8::Value>&, v8::Isolate*, ExceptionState&);
+struct NativeValueTraits<{{cpp_class}}> {
+    static {{cpp_class}} nativeValue(const v8::Local<v8::Value>&, v8::Isolate*, ExceptionState&);
 };
 
-{% endfor %}
-{% for cpp_type in nullable_cpp_types %}
-class V8{{cpp_type}}OrNull final {
+{% if needs_ornull_converter %}
+class {{v8_class}}OrNull final {
 public:
-    static void toImpl(v8::Isolate* isolate, v8::Local<v8::Value> v8Value, {{cpp_type}}& impl, ExceptionState& exceptionState)
+    static void toImpl(v8::Isolate* isolate, v8::Local<v8::Value> v8Value, {{cpp_class}}& impl, ExceptionState& exceptionState)
     {
         {# http://heycam.github.io/webidl/#es-union #}
         {# 1. null or undefined #}
         if (isUndefinedOrNull(v8Value))
             return;
-        V8{{cpp_type}}::toImpl(isolate, v8Value, impl, exceptionState);
+        {{v8_class}}::toImpl(isolate, v8Value, impl, exceptionState);
     }
 };
 
-{% endfor %}
+{% endif %}
 } // namespace blink
 
-#endif // {{macro_guard}}
+#endif // {{cpp_class}}_h