271     class UniqueID {
273         static UniqueID InvalidID() {  in InvalidID()
274             return UniqueID(uint32_t(SK_InvalidUniqueID));  in InvalidID()
278         explicit UniqueID(const GrGpuResource::UniqueID& id) : fID(id.asUInt()) { }  in UniqueID()  function
280         UniqueID() : fID(GrGpuResource::CreateUniqueID()) { }  in UniqueID()  function
284         bool operator==(const UniqueID& other) const {
287         bool operator!=(const UniqueID& other) const {
295         explicit UniqueID(uint32_t id) : fID(id) {}  in UniqueID()  function
315     UniqueID uniqueID() const { return fUniqueID; }  in uniqueID()
317     UniqueID underlyingUniqueID() const {  in underlyingUniqueID()
319             return UniqueID(fTarget->uniqueID());  in underlyingUniqueID()
493     const UniqueID         fUniqueID; // set from the backing resource for wrapped resources