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

src/gpu/GrGpu.h

Index: src/gpu/GrGpu.h
diff --git a/src/gpu/GrGpu.h b/src/gpu/GrGpu.h
index f8528a1550ac60ed45599af95b4a3869fedad43b..d5ef909d28376e92e5b03dd031556fa1d72a1a4f 100644
--- a/src/gpu/GrGpu.h
+++ b/src/gpu/GrGpu.h
@@ -423,7 +423,8 @@ public:
         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