Revert of Generate separate files for union type containers

third_party/WebKit/Source/bindings/templates/union.h

+{% include 'copyright_block.txt' %}
+#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 {{exported}}{{container.cpp_class}} final {
+    DISALLOW_NEW_EXCEPT_PLACEMENT_NEW();
+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 %}
+    {{container.cpp_class}}(const {{container.cpp_class}}&);
+    ~{{container.cpp_class}}();
+    {{container.cpp_class}}& operator=(const {{container.cpp_class}}&);
+    DECLARE_TRACE();
+
+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 {{exported}}v8::Local<v8::Value> toV8(const {{container.cpp_class}}&, v8::Local<v8::Object>, v8::Isolate*);
+};
+
+class V8{{container.cpp_class}} final {
+public:
+    {{exported}}static void toImpl(v8::Isolate*, v8::Local<v8::Value>, {{container.cpp_class}}&, UnionTypeConversionMode, ExceptionState&);
+};
+
+{{exported}}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}}> {
+    {{exported}}static {{container.cpp_class}} nativeValue(v8::Isolate*, v8::Local<v8::Value>, ExceptionState&);
+};
+
+{% endfor %}
+} // namespace blink
+
+// We need to set canInitializeWithMemset=true because HeapVector supports
+// items that can initialize with memset or have a vtable. It is safe to
+// set canInitializeWithMemset=true for a union type object in practice.
+// See https://codereview.chromium.org/1118993002/#msg5 for more details.
+{% for container in containers %}
+WTF_ALLOW_MOVE_AND_INIT_WITH_MEM_FUNCTIONS(blink::{{container.cpp_class}});
+{% endfor %}
+
+#endif // {{macro_guard}}