Refactor SkyShell to allow multiple SkyViews

sky/shell/shell_view.h

+// Copyright 2015 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_SHELL_SHELL_VIEW_H_
+#define SKY_SHELL_SHELL_VIEW_H_
+
+#include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
+
+namespace sky {
+namespace shell {
+class Engine;
+class PlatformView;
+class Rasterizer;
+class Shell;
+
+class ShellView {
+ public:
+  explicit ShellView(Shell& shell);
+  ~ShellView();
+
+  PlatformView* view() const { return view_.get(); }
+
+ private:
+  void CreateEngine();
+  void CreatePlatformView();
+
+  Shell& shell_;
+  scoped_ptr<PlatformView> view_;
+  scoped_ptr<Rasterizer> rasterizer_;
+  scoped_ptr<Engine> engine_;
+
+  DISALLOW_COPY_AND_ASSIGN(ShellView);
+};
+
+}  // namespace shell
+}  // namespace sky
+
+#endif  // SKY_SHELL_SHELL_VIEW_H_