Make //mojo/edk/js a component.

mojo/edk/js/handle.h

Index: mojo/edk/js/handle.h
diff --git a/mojo/edk/js/handle.h b/mojo/edk/js/handle.h
index 2470fac9f11d93396abbf1cc7bed8f5f585bb6b8..60652ed8c2cc49a07d373b8d1c18bba2b67d99a5 100644
--- a/mojo/edk/js/handle.h
+++ b/mojo/edk/js/handle.h
@@ -11,6 +11,7 @@
 #include "gin/converter.h"
 #include "gin/handle.h"
 #include "gin/wrappable.h"
+#include "mojo/edk/js/js_export.h"
 #include "mojo/public/cpp/system/core.h"
 
 namespace mojo {
@@ -21,7 +22,7 @@ class HandleCloseObserver;
 
 // Wrapper for mojo Handles exposed to JavaScript. This ensures the Handle
 // is Closed when its JS object is garbage collected.
-class HandleWrapper : public gin::Wrappable<HandleWrapper> {
+class MOJO_JS_EXPORT HandleWrapper : public gin::Wrappable<HandleWrapper> {
  public:
   static gin::WrapperInfo kWrapperInfo;
 
@@ -56,16 +57,16 @@ namespace gin {
 // MojoHandle, since that will do a simple int32_t conversion. It's unfortunate
 // there's no way to prevent against accidental use.
 // TODO(mpcomplete): define converters for all Handle subtypes.
-template<>
-struct Converter<mojo::Handle> {
+template <>
+struct MOJO_JS_EXPORT Converter<mojo::Handle> {
   static v8::Handle<v8::Value> ToV8(v8::Isolate* isolate,
                                     const mojo::Handle& val);
   static bool FromV8(v8::Isolate* isolate, v8::Handle<v8::Value> val,
                      mojo::Handle* out);
 };
 
-template<>
-struct Converter<mojo::MessagePipeHandle> {
+template <>
+struct MOJO_JS_EXPORT Converter<mojo::MessagePipeHandle> {
   static v8::Handle<v8::Value> ToV8(v8::Isolate* isolate,
                                     mojo::MessagePipeHandle val);
   static bool FromV8(v8::Isolate* isolate,
@@ -76,7 +77,7 @@ struct Converter<mojo::MessagePipeHandle> {
 // We need to specialize the normal gin::Handle converter in order to handle
 // converting |null| to a wrapper for an empty mojo::Handle.
 template <>
-struct Converter<gin::Handle<mojo::edk::js::HandleWrapper>> {
+struct MOJO_JS_EXPORT Converter<gin::Handle<mojo::edk::js::HandleWrapper>> {
   static v8::Handle<v8::Value> ToV8(
       v8::Isolate* isolate,
       const gin::Handle<mojo::edk::js::HandleWrapper>& val) {