add getBounds to SkTypeface

include/core/SkLazyPtr.h

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkLazyPtr_DEFINED
 #define SkLazyPtr_DEFINED
 
@@ skipping 129 matching lines @@
 //   - it has a constructor to zero itself;
 //   - it has a destructor to clean up;
 //   - get() calls SkNew(T) to create the pointer;
 //   - get(functor) calls functor to create the pointer.
 template <typename T, void (*Destroy)(T*) = Private::sk_delete<T> >
 class SkLazyPtr : SkNoncopyable {
 public:
     SkLazyPtr() : fPtr(NULL) {}
     ~SkLazyPtr() { if (fPtr) { Destroy((T*)fPtr); } }
 
-    T* get() {
+    T* get() const {
         T* ptr = (T*)sk_consume_load(&fPtr);
         return ptr ? ptr : Private::try_cas<T*, Destroy>(&fPtr, SkNEW(T));
     }
 
     template <typename Create>
-    T* get(const Create& create) {
+    T* get(const Create& create) const {
         T* ptr = (T*)sk_consume_load(&fPtr);
         return ptr ? ptr : Private::try_cas<T*, Destroy>(&fPtr, create());
     }
 
 private:
-    void* fPtr;
+    mutable void* fPtr;
 };
 
 
 #endif//SkLazyPtr_DEFINED