Teach SkyView path to draw a circle

sky/engine/bindings/builtin_sky.cc

Index: sky/engine/bindings/builtin_sky.cc
diff --git a/sky/engine/bindings/builtin_sky.cc b/sky/engine/bindings/builtin_sky.cc
index 8546f762d31258a8e46d346c584cc31ad3bd1d18..00d7ee8f8c3ca53987971ffdcb140905b5d2dfea 100644
--- a/sky/engine/bindings/builtin_sky.cc
+++ b/sky/engine/bindings/builtin_sky.cc
@@ -8,6 +8,7 @@
 #include "sky/engine/bindings/builtin.h"
 #include "sky/engine/core/frame/LocalDOMWindow.h"
 #include "sky/engine/core/script/dom_dart_state.h"
+#include "sky/engine/core/view/View.h"
 #include "sky/engine/tonic/dart_error.h"
 
 namespace blink {
@@ -27,6 +28,11 @@ void BuiltinSky::InstallWindow(DOMDartState* dart_state) {
   // TODO(abarth): Retain the document wrapper.
 }
 
+void BuiltinSky::InstallView(View* view) {
+  CHECK(!LogIfError(
+      Dart_SetField(library_.value(), ToDart("view"), ToDart(view))));
+}
+
 Dart_Handle BuiltinSky::GetClassByName(const char* class_name) {
   Dart_Handle name_handle = ToDart(class_name);
   Dart_Handle class_handle = Dart_GetType(library_.value(), name_handle, 0, nullptr);