Add skstd::remove_pointer_t and use it.

include/private/SkTLogic.h

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  *
  *
  * This header provides some of the helpers (like std::enable_if_t) which will
  * become available with C++14 in the type_traits header (in the skstd
  * namespace). This header also provides several Skia specific additions such
@@ skipping 13 matching lines @@
 namespace skstd {
 
 template <bool B> using bool_constant = std::integral_constant<bool, B>;
 
 template <bool B, typename T, typename F> using conditional_t = typename std::conditional<B, T, F>::type;
 template <bool B, typename T = void> using enable_if_t = typename std::enable_if<B, T>::type;
 
 template <typename T> using remove_const_t = typename std::remove_const<T>::type;
 template <typename T> using remove_volatile_t = typename std::remove_volatile<T>::type;
 template <typename T> using remove_cv_t = typename std::remove_cv<T>::type;
+template <typename T> using remove_pointer_t = typename std::remove_pointer<T>::type;
 template <typename T> using remove_reference_t = typename std::remove_reference<T>::type;
 template <typename T> using remove_extent_t = typename std::remove_extent<T>::type;
 
 template <typename T, typename U> struct is_same : std::false_type {};
 template <typename T> struct is_same<T, T> : std::true_type {};
 
 template <typename T> struct is_void : is_same<void, remove_cv_t<T>> {};
 
 template <typename T> struct is_const : std::false_type {};
 template <typename T> struct is_const<const T> : std::true_type {};
@@ skipping 135 matching lines @@
 template <typename D, typename S> using same_volatile_t = typename same_volatile<D, S>::type;
 template <typename D, typename S> using same_cv = copy_cv<skstd::remove_cv_t<D>, S>;
 template <typename D, typename S> using same_cv_t = typename same_cv<D, S>::type;
 
 }  // namespace sknonstd
 
 // Just a pithier wrapper for enable_if_t.
 #define SK_WHEN(condition, T) skstd::enable_if_t<!!(condition), T>
 
 #endif