Cache render targets that render to wrapped textures

include/gpu/GrTypes.h

Index: include/gpu/GrTypes.h
diff --git a/include/gpu/GrTypes.h b/include/gpu/GrTypes.h
index 3def9aaa993df434948afe15cf8263d655f42776..51bd26cd52a4a2d4f15f9876538f6bf36d367454 100644
--- a/include/gpu/GrTypes.h
+++ b/include/gpu/GrTypes.h
@@ -412,6 +412,23 @@ GR_MAKE_BITFIELD_OPS(GrSurfaceFlags)
 // opaque type for 3D API object handles
 typedef intptr_t GrBackendObject;
 
+enum class GrBackendObjectLifeCycle {
+    /**
+     * The resource is created, owned and freed by Skia.
+     */
+    kInternal,
+    /**
+     * An external resource with ownership transfered into Skia. Skia will free the resource.
+     */
+    kAdopted,
+    /**
+     * An external resource, but Skia does not manage the lifetime of the underlying backend
+     * 3D API object(s). The client is responsible for freeing those. Used to inject client-
+     * created GPU resources into Skia (e.g. to render to a client-created texture).
+     */
+    kBorrowed
+};
+
 /**
  * Some textures will be stored such that the upper and left edges of the content meet at the
  * the origin (in texture coord space) and for other textures the lower and left edges meet at