Teach SkyView path to draw a circle

sky/engine/bindings/builtin_sky.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef SKY_ENGINE_BINDINGS_BUILTIN_SKY_H_
 #define SKY_ENGINE_BINDINGS_BUILTIN_SKY_H_
 
 #include "base/macros.h"
 #include "dart/runtime/include/dart_api.h"
 #include "sky/engine/tonic/dart_class_provider.h"
 #include "sky/engine/tonic/dart_persistent_value.h"
 
 namespace blink {
 class DOMDartState;
+class View;
 
 class BuiltinSky : public DartClassProvider {
  public:
   explicit BuiltinSky(DOMDartState* dart_state);
   ~BuiltinSky();
 
   void InstallWindow(DOMDartState* dart_state);
+  void InstallView(View* view);
 
   // DartClassProvider:
   Dart_Handle GetClassByName(const char* class_name) override;
 
  private:
   DartPersistentValue library_;
 
   DISALLOW_COPY_AND_ASSIGN(BuiltinSky);
 };
 
 }  // namespace blink
 
 #endif  // SKY_ENGINE_BINDINGS_BUILTIN_SKY_H_