Make classes for union types exported.

Source/bindings/templates/union.h

Index: Source/bindings/templates/union.h
diff --git a/Source/bindings/templates/union.h b/Source/bindings/templates/union.h
index 2c1f644475b779b58c8d9398cd6daec7ef8f06ba..7d293b47d73fea268dcb1c11072c8bcd07c4d23c 100644
--- a/Source/bindings/templates/union.h
+++ b/Source/bindings/templates/union.h
@@ -18,7 +18,7 @@ class {{decl}};
 {% endfor %}
 
 {% for container in containers %}
-class {{container.cpp_class}} final {
+class {{exported}}{{container.cpp_class}} final {
     ALLOW_ONLY_INLINE_ALLOCATION();
 public:
     {{container.cpp_class}}();
@@ -31,6 +31,14 @@ public:
     static {{container.cpp_class}} from{{member.type_name}}({{member.rvalue_cpp_type}});
 
     {% endfor %}
+#if COMPILER(MSVC) && defined(COMPONENT_BUILD) && LINK_CORE_MODULES_SEPARATELY

[haraken, 2015/04/02 09:13:09]

It would be better to change LINK_CORE_MODULES_SEPARATELY to a gyp flag and
remove defined(COMPONENT_BUILD) from here. A follow-up CL is fine.

+    // Explicit declarations of copy constructor, destructor and operator=,
+    // because msvc automatically generates them if they are not declared in
+    // this header.
+    {{container.cpp_class}}(const {{container.cpp_class}}&);
+    ~{{container.cpp_class}}();
+    {{container.cpp_class}}& operator=(const {{container.cpp_class}}&);
+#endif
     {% if container.needs_trace %}
     DECLARE_TRACE();
 
@@ -48,15 +56,15 @@ private:
     {{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 {{exported}}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&);
+    {{exported}}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*);
+{{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)