Add EmbeddedWorker interfaces in Blink API

public/web/WebEmbeddedWorkerStartMode.h

Index: public/web/WebEmbeddedWorkerStartMode.h
diff --git a/public/platform/WebCallbacks.h b/public/web/WebEmbeddedWorkerStartMode.h
similarity index 87%
copy from public/platform/WebCallbacks.h
copy to public/web/WebEmbeddedWorkerStartMode.h
index ba023d32cce145c7a5cf7f38e9693a86f6a8bff3..33036bbdcff81536844dc807130e1766bdf0af57 100644
--- a/public/platform/WebCallbacks.h
+++ b/public/web/WebEmbeddedWorkerStartMode.h
@@ -28,19 +28,16 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef WebCallbacks_h
-#define WebCallbacks_h
+#ifndef WebEmbeddedWorkerStartMode_h
+#define WebEmbeddedWorkerStartMode_h
 
 namespace WebKit {
 
-template<typename S, typename T>
-class WebCallbacks {
-public:
-    virtual ~WebCallbacks() { };
-    virtual void onSuccess(S*) { };
-    virtual void onError(T*) { };
+enum WebEmbeddedWorkerStartMode {
+    WebEmbeddedWorkerStartModeDontPauseOnStart,
+    WebEmbeddedWorkerStartModePauseOnStart
 };
 
 } // namespace WebKit
 
-#endif
+#endif // WebEmbeddedWorkerStartMode_h