Add offscreen mode to visualbench

tools/VisualBench/WrappedBenchmark.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef WrappedBenchmark_DEFINED
 #define WrappedBenchmark_DEFINED
 
@@ skipping 77 matching lines @@
         SkPaint blitPaint;
         blitPaint.setXfermodeMode(SkXfermode::kSrc_Mode);
         canvas->drawImageRect(image, SkIRect::MakeWH(w, h),
                               SkRect::MakeWH(SkIntToScalar(w), SkIntToScalar(h)), &blitPaint);
     }
 
     typedef WrappedBenchmark INHERITED;
 };
 
 // Create an MSAA & NVPR-enabled GPU backend
-class NvprWrappedBenchmark : public WrappedBenchmark {
+class GpuWrappedBenchmark : public WrappedBenchmark {
 public:
-    explicit NvprWrappedBenchmark(const SkSurfaceProps& surfaceProps, Benchmark* bench,
-                                  int numSamples)
+    explicit GpuWrappedBenchmark(const SkSurfaceProps& surfaceProps, Benchmark* bench,
+                                 int numSamples)
         : INHERITED(surfaceProps, bench)
         , fNumSamples(numSamples) {}
 
 private:
     void setupOffScreen(SkCanvas* canvas) override {
         fOffScreen.reset(SkSurface::NewRenderTarget(canvas->getGrContext(),
                                                     SkSurface::kNo_Budgeted,
                                                     canvas->imageInfo(),
                                                     fNumSamples,
                                                     &this->surfaceProps()));
@@ skipping 21 matching lines @@
         offscreenIter.next();
         SkASSERT(offscreenIter.done());
 #endif
     }
 
     int fNumSamples;
     typedef WrappedBenchmark INHERITED;
 };
 
 #endif //WrappedBenchmark_DEFINED