Make SkTDArray accessors const-friendly

include/core/SkTDict.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 SkTDict_DEFINED
@@ skipping 66 matching lines @@
         {
             if (value)
                 *value = fArray[index].fValue;
             return true;
         }
         return false;
     }
 
     bool findKey(T& value, const char** name) const
     {
-        Pair* end = fArray.end();
-        for (Pair* pair = fArray.begin(); pair < end; pair++) {
+        const Pair* end = fArray.end();
+        for (const Pair* pair = fArray.begin(); pair < end; pair++) {
             if (pair->fValue != value)
                 continue;
             *name = pair->fName;
             return true;
         }
         return false;
     }
 
 public:
     struct Pair {
@@ skipping 25 matching lines @@
             if (fIter < fStop)
             {
                 name = fIter->fName;
                 if (value)
                     *value = fIter->fValue;
                 fIter += 1;
             }
             return name;
         }
     private:
-        Pair*   fIter;
-        Pair*   fStop;
+        const Pair*   fIter;
+        const Pair*   fStop;
     };
 
 private:
     SkTDArray<Pair> fArray;
     SkChunkAlloc    fStrings;
 
     int find_index(const char name[]) const
     {
         return find_index(name, strlen(name));
     }
 
     int find_index(const char name[], size_t len) const
     {
         SkASSERT(name);
 
         int count = fArray.count();
         int index = ~0;
 
         if (count)
             index = SkStrSearch(&fArray.begin()->fName, count, name, len, sizeof(Pair));
         return index;
     }
     friend class Iter;
 };
 
 #endif