SkyShell should be able to draw a green square with GL

sky/shell/sky_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_SKY_VIEW_H_
+#define SKY_SHELL_SKY_VIEW_H_
+
+#include "base/android/jni_weak_ref.h"
+#include "base/android/scoped_java_ref.h"
+#include "base/macros.h"
+#include "ui/gfx/native_widget_types.h"
+
+struct ANativeWindow;
+
+namespace sky {
+namespace shell {
+
+class SkyView {
+ public:
+  static bool Register(JNIEnv* env);
+
+  class Delegate {
+   public:
+    virtual void OnAcceleratedWidgetAvailable(
+        gfx::AcceleratedWidget widget) = 0;
+    virtual void OnDestroyed() = 0;
+
+   protected:
+    virtual ~Delegate();
+  };
+
+  explicit SkyView(Delegate* delegate);
+  ~SkyView();
+
+  void Init();
+
+  // Called from Java
+  void Destroy(JNIEnv* env, jobject obj);
+  void SurfaceCreated(JNIEnv* env, jobject obj, jobject jsurface);
+  void SurfaceDestroyed(JNIEnv* env, jobject obj);
+  void SurfaceSetSize(JNIEnv* env,
+                      jobject obj,
+                      jint width,
+                      jint height,
+                      jfloat density);
+
+ private:
+  void ReleaseWindow();
+
+  Delegate* delegate_;
+  ANativeWindow* window_;
+
+  DISALLOW_COPY_AND_ASSIGN(SkyView);
+};
+
+}  // namespace shell
+}  // namespace sky
+
+#endif  // SKY_SHELL_SKY_VIEW_H_