Reland: Generate separate files for union type containers

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

 {% include 'copyright_block.txt' %}
-#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 {{exported}}{{container.cpp_class}} final {
+class {{exported}}{{cpp_class}} final {
     DISALLOW_NEW_EXCEPT_PLACEMENT_NEW();
 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 %}
-    {{container.cpp_class}}(const {{container.cpp_class}}&);
-    ~{{container.cpp_class}}();
-    {{container.cpp_class}}& operator=(const {{container.cpp_class}}&);
+    {{cpp_class}}(const {{cpp_class}}&);
+    ~{{cpp_class}}();
+    {{cpp_class}}& operator=(const {{cpp_class}}&);
     DECLARE_TRACE();
 
 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 {{exported}}v8::Local<v8::Value> toV8(const {{container.cpp_class}}&, v8::Local<v8::Object>, v8::Isolate*);
+    friend {{exported}}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:
-    {{exported}}static void toImpl(v8::Isolate*, v8::Local<v8::Value>, {{container.cpp_class}}&, UnionTypeConversionMode, ExceptionState&);
+    {{exported}}static void toImpl(v8::Isolate*, v8::Local<v8::Value>, {{cpp_class}}&, UnionTypeConversionMode, ExceptionState&);
 };
 
-{{exported}}v8::Local<v8::Value> toV8(const {{container.cpp_class}}&, v8::Local<v8::Object>, v8::Isolate*);
+{{exported}}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}}> {
-    {{exported}}static {{container.cpp_class}} nativeValue(v8::Isolate*, v8::Local<v8::Value>, ExceptionState&);
+struct NativeValueTraits<{{cpp_class}}> {
+    {{exported}}static {{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 %}
+WTF_ALLOW_MOVE_AND_INIT_WITH_MEM_FUNCTIONS(blink::{{cpp_class}});
 
-#endif // {{macro_guard}}
+#endif // {{cpp_class}}_h