Cache render targets that render to wrapped textures

tools/gpu/GrTest.cpp

Index: tools/gpu/GrTest.cpp
diff --git a/tools/gpu/GrTest.cpp b/tools/gpu/GrTest.cpp
index bfd7136bc07cc182882d54b4ab5d933b1b1eb332..26850be607371994756a1f4b92c3376c25c227d0 100644
--- a/tools/gpu/GrTest.cpp
+++ b/tools/gpu/GrTest.cpp
@@ -339,6 +339,14 @@ private:
         return nullptr;
     }
 
+    void onComputeBackendTextureKeyForWrapAsRenderTarget(const GrBackendTextureDesc&,
+                                                         GrUniqueKey*) override {
+    }
+    bool onRewrapRenderTargetWithBackendTexture(const GrBackendTextureDesc&,
+                                                GrRenderTarget*) override {
+        return nullptr;
+    }
+
     GrRenderTarget* onWrapBackendTextureAsRenderTarget(const GrBackendTextureDesc&) override {
         return nullptr;
     }