Revert "Revert of Add getReducedClipStack to lua canvas (https://codereview.chromium.org/180283004/…

src/core/SkTLList.h

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkTLList_DEFINED
 #define SkTLList_DEFINED
 
@@ skipping 180 matching lines @@
 
     public:
         typedef typename INHERITED::IterStart IterStart;
         //!< Start the iterator at the head of the list.
         static const IterStart kHead_IterStart = INHERITED::kHead_IterStart;
         //!< Start the iterator at the tail of the list.
         static const IterStart kTail_IterStart = INHERITED::kTail_IterStart;
 
         Iter() {}
 
-        Iter(const SkTLList& list, IterStart start) {
+        Iter(const SkTLList& list, IterStart start = kHead_IterStart) {
             INHERITED::init(list.fList, start);
         }
 
-        T* init(const SkTLList& list, IterStart start) {
+        T* init(const SkTLList& list, IterStart start = kHead_IterStart) {
             return this->nodeToObj(INHERITED::init(list.fList, start));
         }
 
         T* get() { return this->nodeToObj(INHERITED::get()); }
 
         T* next() { return this->nodeToObj(INHERITED::next()); }
 
         T* prev() { return this->nodeToObj(INHERITED::prev()); }
 
         Iter& operator= (const Iter& iter) { INHERITED::operator=(iter); return *this; }
@@ skipping 178 matching lines @@
 #define SkNEW_INSERT_IN_LLIST_AFTER(list, location, type_name, args) \
     (new ((list), SkTLList< type_name >::kAfter_Placement, (location)) type_name args)
 
 #define SkNEW_INSERT_AT_LLIST_HEAD(list, type_name, args) \
     SkNEW_INSERT_IN_LLIST_BEFORE((list), (list)->headIter(), type_name, args)
 
 #define SkNEW_INSERT_AT_LLIST_TAIL(list, type_name, args) \
     SkNEW_INSERT_IN_LLIST_AFTER((list), (list)->tailIter(), type_name, args)
 
 #endif