Add test configs for instanced rendering

tools/gpu/GrContextFactory.h

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrContextFactory_DEFINED
 #define GrContextFactory_DEFINED
 
@@ skipping 74 matching lines @@
 
     static const int kContextTypeCnt = kLastContextType + 1;
 
     /**
      * Options for GL context creation. For historical and testing reasons the options will default
      * to not using GL_NV_path_rendering extension  even when the driver supports it.
      */
     enum ContextOptions {
         kNone_ContextOptions                = 0x0,
         kEnableNVPR_ContextOptions          = 0x1,
-        kRequireSRGBSupport_ContextOptions  = 0x2,
+        kUseInstanced_ContextOptions        = 0x2,
+        kRequireSRGBSupport_ContextOptions  = 0x4,
     };
 
     static ContextType NativeContextTypeForBackend(GrBackend backend) {
         switch (backend) {
             case kOpenGL_GrBackend:
                 return kNativeGL_ContextType;
             case kVulkan_GrBackend:
                 return kVulkan_ContextType;
             default:
                 SkFAIL("Unknown backend");
@@ skipping 73 matching lines @@
         TestContext*    fTestContext;
         GrContext*      fGrContext;
         bool            fAbandoned;
     };
     SkTArray<Context, true>         fContexts;
     SkAutoTDelete<GLTestContext>    fSentinelGLContext;
     const GrContextOptions          fGlobalOptions;
 };
 }  // namespace sk_gpu_test
 #endif