Add offscreen mode to visualbench

tools/VisualBench/WrappedBenchmark.h

Index: tools/VisualBench/WrappedBenchmark.h
diff --git a/tools/VisualBench/WrappedBenchmark.h b/tools/VisualBench/WrappedBenchmark.h
index fc95ce0e2eac328d7aa48e1dda2ec66f72a1884a..5e39cac51098f5853e1cd0176049b6659729564c 100644
--- a/tools/VisualBench/WrappedBenchmark.h
+++ b/tools/VisualBench/WrappedBenchmark.h
@@ -94,10 +94,10 @@ private:
 };
 
 // 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) {}