update example

experimental/SkiaExamples/HelloSkiaExample.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  *
  */
 
 #include "SkExample.h"
 
-#include "SkApplication.h"
-#include "SkDraw.h"
+#include "SkCanvas.h"
 #include "SkGradientShader.h"
-#include "SkGraphics.h"
 
 class HelloSkia : public SkExample {
 public:
     HelloSkia(SkExampleWindow* window) : SkExample(window) {
         fName = "HelloSkia";
         fBGColor = SK_ColorWHITE;
         fRotationAngle = SkIntToScalar(0);
-
-        fWindow->setupBackend(SkExampleWindow::kGPU_DeviceType);
-        // Another option is software rendering:
-        // fWindow->setupBackend(SkExampleWindow::kRaster_DeviceType);
     }
 
 protected:
     void draw(SkCanvas* canvas) {
         // Clear background
         canvas->drawColor(fBGColor);
 
         SkPaint paint;
         paint.setColor(SK_ColorRED);
 
@@ skipping 60 matching lines @@
     SkScalar fRotationAngle;
     SkColor fBGColor;
 };
 
 static SkExample* MyFactory(SkExampleWindow* window) {
     return new HelloSkia(window);
 }
 
 // Register this class as a Skia Example.
 SkExample::Registry registry(MyFactory);