Cache render targets that render to wrapped textures

include/gpu/GrTexture.h

Index: include/gpu/GrTexture.h
diff --git a/include/gpu/GrTexture.h b/include/gpu/GrTexture.h
index 1d589eddcef3ba44504cda3e1785a263cbda6996..f597f57c87c6de7d902d573151e912db0188c612 100644
--- a/include/gpu/GrTexture.h
+++ b/include/gpu/GrTexture.h
@@ -46,12 +46,14 @@ public:
     inline const GrTexturePriv texturePriv() const;
 
 protected:
-    GrTexture(GrGpu*, LifeCycle, const GrSurfaceDesc&, GrSLType, bool wasMipMapDataProvided);
-
+    GrTexture(GrGpu*, SkBudgeted, const GrSurfaceDesc&, GrSLType, bool wasMipMapDataProvided);
+    void initScratchKeyIfNeeded();
     void validateDesc() const;
 
-private:
+    // In protected because subclass GrGLTexture calls this version.
     size_t onGpuMemorySize() const override;
+
+private:
     void dirtyMipMaps(bool mipMapsDirty);
 
     enum MipMapsStatus {