Add exports needed for glue to build as a component.

webkit/glue/image_decoder.h

Index: webkit/glue/image_decoder.h
diff --git a/webkit/glue/image_decoder.h b/webkit/glue/image_decoder.h
index b19c8ef867d438f4744692e5aa7622d48a1b85d5..1140e8c5bf5f30f7255f717183ed75b8af74e3db 100644
--- a/webkit/glue/image_decoder.h
+++ b/webkit/glue/image_decoder.h
@@ -4,6 +4,7 @@
 
 #include "base/basictypes.h"
 #include "ui/gfx/size.h"
+#include "webkit/glue/webkit_glue_export.h"
 
 class SkBitmap;
 
@@ -14,7 +15,7 @@ namespace webkit_glue {
 // Note to future: This class should be deleted. We should have our own nice
 // image decoders in base/gfx, and our port should use those. Currently, it's
 // the other way around.
-class ImageDecoder {
+class WEBKIT_GLUE_EXPORT ImageDecoder {
  public:
   // Use the constructor with desired_size when you think you may have an .ico
   // format and care about which size you get back. Otherwise, use the 0-arg