Have gpu createTestingOlyBackendTexture know if it is a render target or not

src/gpu/GrGpu.h

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrGpu_DEFINED
 #define GrGpu_DEFINED
 
@@ skipping 405 matching lines @@
         void incNumFailedDraws() {}
 #endif
     };
 
     Stats* stats() { return &fStats; }
 
     /** Creates a texture directly in the backend API without wrapping it in a GrTexture. This is
         only to be used for testing (particularly for testing the methods that import an externally
         created texture into Skia. Must be matched with a call to deleteTestingOnlyTexture(). */
     virtual GrBackendObject createTestingOnlyBackendTexture(void* pixels, int w, int h,
-                                                            GrPixelConfig config) = 0;
+                                                            GrPixelConfig config,
+                                                            bool isRenderTarget = false) = 0;
     /** Check a handle represents an actual texture in the backend API that has not been freed. */
     virtual bool isTestingOnlyBackendTexture(GrBackendObject) const = 0;
     /** If ownership of the backend texture has been transferred pass true for abandonTexture. This
         will do any necessary cleanup of the handle without freeing the texture in the backend
         API. */
     virtual void deleteTestingOnlyBackendTexture(GrBackendObject,
                                                  bool abandonTexture = false) = 0;
 
     // width and height may be larger than rt (if underlying API allows it).
     // Returns nullptr if compatible sb could not be created, otherwise the caller owns the ref on
@@ skipping 138 matching lines @@
     SkTArray<const MultisampleSpecs*, true>                             fMultisampleSpecsMap;
     GrTAllocator<MultisampleSpecs>                                      fMultisampleSpecsAllocator;
     // The context owns us, not vice-versa, so this ptr is not ref'ed by Gpu.
     GrContext*                                                          fContext;
 
     friend class GrPathRendering;
     typedef SkRefCnt INHERITED;
 };
 
 #endif