Teach SkyView path to draw a circle

sky/engine/core/script/dart_controller.h

Index: sky/engine/core/script/dart_controller.h
diff --git a/sky/engine/core/script/dart_controller.h b/sky/engine/core/script/dart_controller.h
index 5e2717ec59c914faf7bbb74febbc31eeee8c17bf..270aabd06088ea5436f88a4bae57a4bb83c20496 100644
--- a/sky/engine/core/script/dart_controller.h
+++ b/sky/engine/core/script/dart_controller.h
@@ -20,6 +20,7 @@ class DOMDartState;
 class DartValue;
 class HTMLScriptElement;
 class KURL;
+class View;
 
 class DartController {
  public:
@@ -44,6 +45,7 @@ class DartController {
   void ClearForClose();
   void CreateIsolateFor(PassOwnPtr<DOMDartState> dom_dart_state,
                         const KURL& url);
+  void InstallView(View* view);
 
   DOMDartState* dart_state() const { return dom_dart_state_.get(); }