Fix SampleApp compilation with skia_gpu=0

gm/deferredtextureimage.cpp

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #include <vector>
 
 #include "gm.h"
-#include "GrContext.h"
 #include "SkMipMap.h"
 #include "Resources.h"
 
 #if SK_SUPPORT_GPU
+#include "GrContext.h"
 
 // Helper function that uploads the given SkImage using MakdeFromDeferredTextureImageData and then
 // draws the uploaded version at the specified coordinates.
 static void DrawDeferredTextureImageData(SkCanvas* canvas,
                                          SkImage::DeferredTextureImageUsageParams* params) {
     GrContext* context = canvas->getGrContext();
     if (!context) {
         skiagm::GM::DrawGpuOnlyMessage(canvas);
         return;
     }
@@ skipping 151 matching lines @@
     DrawDeferredTextureImageMipMapTree(canvas, decodedImage.get(), &params);
 }
 
 DEF_SIMPLE_GM(deferred_texture_image_high, canvas, 512 + 512 + 30, 512 + 20) {
     auto params = SkImage::DeferredTextureImageUsageParams(SkMatrix::MakeScale(1.f, 1.f),
                                                            kHigh_SkFilterQuality, 0);
     DrawDeferredTextureImageData(canvas, &params);
 }
 
 #endif