Add exports needed for glue to build as a component.

webkit/glue/webdropdata.h

Index: webkit/glue/webdropdata.h
diff --git a/webkit/glue/webdropdata.h b/webkit/glue/webdropdata.h
index a9a4ae76c366b93373d93b807e4e57cc1fddb303..e93011036a5b3935eb18f087eb6a823d96c856a3 100644
--- a/webkit/glue/webdropdata.h
+++ b/webkit/glue/webdropdata.h
@@ -14,6 +14,7 @@
 
 #include "base/string16.h"
 #include "googleurl/src/gurl.h"
+#include "webkit/glue/webkit_glue_export.h"
 
 struct IDataObject;
 
@@ -21,7 +22,7 @@ namespace WebKit {
 class WebDragData;
 }
 
-struct WebDropData {
+struct WEBKIT_GLUE_EXPORT WebDropData {
   // Construct from a WebDragData object.
   explicit WebDropData(const WebKit::WebDragData&);