Remove openglui embedder code

runtime/embedders/openglui/common/graphics_handler.h

-// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-#ifndef EMBEDDERS_OPENGLUI_COMMON_GRAPHICS_HANDLER_H_
-#define EMBEDDERS_OPENGLUI_COMMON_GRAPHICS_HANDLER_H_
-
-#include "embedders/openglui/common/isized.h"
-#include "embedders/openglui/common/opengl.h"
-#include "embedders/openglui/common/support.h"
-#include "embedders/openglui/common/timer.h"
-
-class GraphicsHandler : public ISized {
-  private:
-    void DecoderHack(int x, SkStream* s);
-
-  public:
-    explicit GraphicsHandler(const char* resource_path);
-
-    const int32_t& height() {
-      return height_;
-    }
-
-    const int32_t& width() {
-      return width_;
-    }
-
-    void ApplyOrtho(float maxX, float maxY) const;
-    void ApplyRotation(float degrees) const;
-
-    virtual int32_t Start();
-    virtual void Stop();
-
-    void SwapBuffers() {
-      GLSwapBuffers();
-    }
-
-    virtual int32_t Update();
-
-    void SetViewport(int left, int top, int width, int height);
-
-    SkCanvas* CreateDisplayCanvas();
-    SkCanvas* CreateBitmapCanvas(int width, int height);
-
-    inline const char* resource_path() {
-      return resource_path_;
-    }
-
-    virtual ~GraphicsHandler() {
-    }
-
-  protected:
-    const char* resource_path_;
-    SkAutoGraphics ag;
-    GrContext* grcontext;
-    int32_t width_, height_;
-};
-
-extern GraphicsHandler* graphics;
-
-#endif  // EMBEDDERS_OPENGLUI_COMMON_GRAPHICS_HANDLER_H_
-