Make SkString movable.

include/core/SkString.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 SkString_DEFINED
@@ skipping 108 matching lines @@
     counting to make string assignments and copies very fast
     with no extra RAM cost. Assumes UTF8 encoding.
 */
 class SK_API SkString {
 public:
                 SkString();
     explicit    SkString(size_t len);
     explicit    SkString(const char text[]);
                 SkString(const char text[], size_t len);
                 SkString(const SkString&);
+                SkString(SkString&&);
                 ~SkString();
 
     bool        isEmpty() const { return 0 == fRec->fLength; }
     size_t      size() const { return (size_t) fRec->fLength; }
     const char* c_str() const { return fRec->data(); }
     char operator[](size_t n) const { return this->c_str()[n]; }
 
     bool equals(const SkString&) const;
     bool equals(const char text[]) const;
     bool equals(const char text[], size_t len) const;
@@ skipping 26 matching lines @@
     friend bool operator==(const SkString& a, const SkString& b) {
         return a.equals(b);
     }
     friend bool operator!=(const SkString& a, const SkString& b) {
         return !a.equals(b);
     }
 
     // these methods edit the string
 
     SkString& operator=(const SkString&);
+    SkString& operator=(SkString&&);
     SkString& operator=(const char text[]);
 
     char* writable_str();
     char& operator[](size_t n) { return this->writable_str()[n]; }
 
     void reset();
     /** Destructive resize, does not preserve contents. */
     void resize(size_t len) { this->set(NULL, len); }
     void set(const SkString& src) { *this = src; }
     void set(const char text[]);
@@ skipping 94 matching lines @@
 };
 
 // Split str on any characters in delimiters into out.  (Think, strtok with a sane API.)
 void SkStrSplit(const char* str, const char* delimiters, SkStrSplitMode splitMode,
                 SkTArray<SkString>* out);
 inline void SkStrSplit(const char* str, const char* delimiters, SkTArray<SkString>* out) {
     SkStrSplit(str, delimiters, kCoalesce_SkStrSplitMode, out);
 }
 
 #endif