Specialize SkOncePtr<T[]>.

include/private/SkOncePtr.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkOncePtr_DEFINED
 #define SkOncePtr_DEFINED
 
@@ skipping 22 matching lines @@
     }
 
     operator T*() const {
         return (T*)fOnce;
     }
 
 private:
     SkBaseOncePtr<T> fOnce;
 };
 
+// If you ask for SkOncePtr<T[]>, we'll clean up with delete[] by default.
+template <typename T>
+class SkOncePtr<T[]> : public SkOncePtr<T, skstd::default_delete<T[]>> {};
+
 /* TODO(mtklein): in next CL
 typedef SkBaseOncePtr<void> SkOnceFlag;
 #define SK_DECLARE_STATIC_ONCE(name) namespace {} static SkOnceFlag name
 
 template <typename F>
 inline void SkOnce(SkOnceFlag* once, const F& f) {
     once->get([&]{ f(); return (void*)2; });
 }
 */
 
@@ skipping 41 matching lines @@
     }
 
 private:
     // fState == 0 --> we have not created our ptr yet
     // fState == 1 --> someone is in the middle of creating our ptr
     // else        --> (T*)fState is our ptr
     mutable SkAtomic<uintptr_t> fState;
 };
 
 #endif//SkOncePtr_DEFINED