Add test configs for instanced rendering

bench/nanobench.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include <ctype.h>
 
 #include "nanobench.h"
@@ skipping 389 matching lines @@
 #if SK_SUPPORT_GPU
     if (const auto* gpuConfig = config->asConfigGpu()) {
         if (!FLAGS_gpu)
             return;
 
         auto ctxOptions = GrContextFactory::kNone_ContextOptions;
         if (gpuConfig->getUseNVPR()) {
             ctxOptions = static_cast<GrContextFactory::ContextOptions>(
                 ctxOptions | GrContextFactory::kEnableNVPR_ContextOptions);
         }
+        if (gpuConfig->getUseInstanced()) {
+            ctxOptions = static_cast<GrContextFactory::ContextOptions>(
+                ctxOptions | GrContextFactory::kUseInstanced_ContextOptions);
+        }
         if (SkColorAndColorSpaceAreGammaCorrect(gpuConfig->getColorType(),
                                                 gpuConfig->getColorSpace())) {
             ctxOptions = static_cast<GrContextFactory::ContextOptions>(
                 ctxOptions | GrContextFactory::kRequireSRGBSupport_ContextOptions);
         }
         const auto ctxType = gpuConfig->getContextType();
         const auto sampleCount = gpuConfig->getSamples();
 
         if (const GrContext* ctx = gGrFactory->get(ctxType, ctxOptions)) {
             const auto maxSampleCount = ctx->caps()->maxSampleCount();
@@ skipping 877 matching lines @@
 
     return 0;
 }
 
 #if !defined SK_BUILD_FOR_IOS
 int main(int argc, char** argv) {
     SkCommandLineFlags::Parse(argc, argv);
     return nanobench_main();
 }
 #endif