Remove SK_OFFSETOF from SkTypes, clean up offsetof usage.

include/private/SkTemplates.h

 
 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #ifndef SkTemplates_DEFINED
@@ skipping 25 matching lines @@
 
 template <typename T> inline T&& forward(remove_reference_t<T>& t) /*noexcept*/ {
     return static_cast<T&&>(t);
 }
 template <typename T> inline T&& forward(remove_reference_t<T>&& t) /*noexcept*/ {
     static_assert(!is_lvalue_reference<T>::value,
                   "Forwarding an rvalue reference as an lvalue reference is not allowed.");
     return static_cast<T&&>(t);
 }
 
+template <typename T> add_rvalue_reference_t<T> declval();
+
 }  // namespace skstd
 
 ///@{
 /** SkTConstType<T, CONST>::type will be 'const T' if CONST is true, 'T' otherwise. */
 template <typename T, bool CONST> struct SkTConstType {
     typedef T type;
 };
 template <typename T> struct SkTConstType<T, true> {
     typedef const T type;
 };
@@ skipping 492 matching lines @@
      * Returns void* because this object does not initialize the
      * memory. Use placement new for types that require a cons.
      */
     void* get() { return fStorage.get(); }
     const void* get() const { return fStorage.get(); }
 private:
     SkAlignedSStorage<sizeof(T)*N> fStorage;
 };
 
 #endif