GrResourceCache2 manages scratch texture.

src/gpu/GrTexturePriv.h

Index: src/gpu/GrTexturePriv.h
diff --git a/src/gpu/GrTexturePriv.h b/src/gpu/GrTexturePriv.h
index 9a3e0e215bfe0e2c447cd55bb030ccfbf48d133b..a2da946987f5700a369fe555e6e94aeb94e0f42b 100644
--- a/src/gpu/GrTexturePriv.h
+++ b/src/gpu/GrTexturePriv.h
@@ -39,6 +39,11 @@ public:
         return GrTexture::kNotAllocated_MipMapsStatus != fTexture->fMipMapsStatus;
     }
 
+    static GrResourceKey::ResourceType ResourceType() {
+        static const GrResourceKey::ResourceType gType = GrResourceKey::GenerateResourceType();
+        return gType;
+    }
+
     static GrResourceKey ComputeKey(const GrGpu* gpu,
                                     const GrTextureParams* params,
                                     const GrTextureDesc& desc,