Add exports needed for glue to build as a component.

webkit/glue/webthread_impl.h

Index: webkit/glue/webthread_impl.h
diff --git a/webkit/glue/webthread_impl.h b/webkit/glue/webthread_impl.h
index 842c8c6b0fdcfbaad01ea6694269c4e9b7d58e01..576acc113789b8f426f2e2a56b84286bb5753e17 100644
--- a/webkit/glue/webthread_impl.h
+++ b/webkit/glue/webthread_impl.h
@@ -7,13 +7,14 @@
 #include "base/threading/thread.h"
 #include "base/memory/scoped_ptr.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebThread.h"
+#include "webkit/glue/webkit_glue_export.h"
 
 namespace webkit_glue {
 
 class WebThreadImpl : public WebKit::WebThread {
  public:
-  WebThreadImpl(const char* name);
-  virtual ~WebThreadImpl();
+  WEBKIT_GLUE_EXPORT WebThreadImpl(const char* name);
+  WEBKIT_GLUE_EXPORT virtual ~WebThreadImpl();
 
   virtual void postTask(Task* task) OVERRIDE;
   virtual void postDelayedTask(Task* task, long long delay_ms) OVERRIDE;