IDL: Put generated union type containers in separate files

Source/bindings/templates/union.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}}
 
 {% 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 {
-    ALLOW_ONLY_INLINE_ALLOCATION();
-public:
-    {{container.cpp_class}}();
-    bool isNull() const { return m_type == SpecificTypeNone; }
-
-    {% for member in container.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}});
-
-    {% endfor %}
-    {% if container.needs_trace %}
-    DECLARE_TRACE();
-
-    {% endif %}
-private:
-    enum SpecificTypes {
-        SpecificTypeNone,
-        {% for member in container.members %}
-        {{member.specific_type_enum}},
-        {% endfor %}
-    };
-    SpecificTypes m_type;
-
-    {% for member in container.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*);
-};
-
-class V8{{container.cpp_class}} final {
-public:
-    static void toImpl(v8::Isolate*, v8::Local<v8::Value>, {{container.cpp_class}}&, ExceptionState&);
-};
-
-v8::Local<v8::Value> toV8(const {{container.cpp_class}}&, v8::Local<v8::Object>, v8::Isolate*);
-
-template <class CallbackInfo>
-inline void v8SetReturnValue(const CallbackInfo& callbackInfo, {{container.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&);
-};
-
-{% endfor %}
-{% for cpp_type in nullable_cpp_types %}
-class V8{{cpp_type}}OrNull final {
-public:
-    static void toImpl(v8::Isolate* isolate, v8::Local<v8::Value> v8Value, {{cpp_type}}& 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);
-    }
-};
-
-{% endfor %}
-} // namespace blink
-
 #endif // {{macro_guard}}