Add helpers for creating UI components.

mojo/ui/gl_view.h

Index: mojo/ui/gl_view.h
diff --git a/mojo/ui/gl_view.h b/mojo/ui/gl_view.h
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+// 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 MOJO_UI_GL_VIEW_H_
+#define MOJO_UI_GL_VIEW_H_
+
+#include "mojo/gpu/gl_context.h"
+#include "mojo/gpu/gl_context_owner.h"
+#include "mojo/ui/base_view.h"
+#include "mojo/ui/gl_renderer.h"
+
+namespace mojo {
+namespace ui {
+
+// Abstract base implementation of the View interface for simple applications
+// which use GL for rendering.  Subclasses must handle layout and provide
+// content for the scene.
+class GLView : public BaseView {
+ public:
+  GLView(
+      mojo::ApplicationImpl* app_impl,
+      const std::string& label,
+      const mojo::ui::ViewProvider::CreateViewCallback& create_view_callback);
+
+  ~GLView() override;
+
+  // Gets the GL context, or null if none.
+  const base::WeakPtr<mojo::GLContext>& gl_context() const {
+    return gl_context_owner_.context();
+  }
+
+  // Gets the GL renderer.
+  mojo::ui::GLRenderer* gl_renderer() { return &gl_renderer_; }
+
+ private:
+  mojo::GLContextOwner gl_context_owner_;
+  mojo::ui::GLRenderer gl_renderer_;
+
+  MOJO_DISALLOW_COPY_AND_ASSIGN(GLView);
+};
+
+}  // namespace ui
+}  // namespace mojo
+
+#endif  // MOJO_UI_GL_VIEW_H_