Fix dart:sky.internals to work in SkyView

sky/engine/public/sky/sky_view_client.h

Index: sky/engine/public/sky/sky_view_client.h
diff --git a/sky/engine/public/sky/sky_view_client.h b/sky/engine/public/sky/sky_view_client.h
index 54ab8262e38113231aeed164df1ef0af67b188d5..1657afcfd42885df1ebf2eae9737708e0d8aa603 100644
--- a/sky/engine/public/sky/sky_view_client.h
+++ b/sky/engine/public/sky/sky_view_client.h
@@ -5,12 +5,16 @@
 #ifndef SKY_ENGINE_PUBLIC_SKY_SKY_VIEW_CLIENT_H_
 #define SKY_ENGINE_PUBLIC_SKY_SKY_VIEW_CLIENT_H_
 
+typedef struct _Dart_Isolate* Dart_Isolate;
+
 namespace blink {
 
 class SkyViewClient {
  public:
   virtual void ScheduleFrame() = 0;
 
+  virtual void DidCreateIsolate(Dart_Isolate isolate) = 0;
+
  protected:
   virtual ~SkyViewClient();
 };