Make SkPaint movable.

include/core/SkPaint.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 SkPaint_DEFINED
 #define SkPaint_DEFINED
 
@@ skipping 34 matching lines @@
 /** \class SkPaint
 
     The SkPaint class holds the style and color information about how to draw
     geometries, text and bitmaps.
 */
 
 class SK_API SkPaint {
 public:
     SkPaint();
     SkPaint(const SkPaint& paint);
+    SkPaint(SkPaint&& paint);
     ~SkPaint();
 
     SkPaint& operator=(const SkPaint&);
+    SkPaint& operator=(SkPaint&&);
 
     /** operator== may give false negatives: two paints that draw equivalently
         may return false.  It will never give false positives: two paints that
         are not equivalent always return false.
     */
     SK_API friend bool operator==(const SkPaint& a, const SkPaint& b);
     friend bool operator!=(const SkPaint& a, const SkPaint& b) {
         return !(a == b);
     }
 
@@ skipping 1019 matching lines @@
     friend class GrStencilAndCoverTextContext;
     friend class GrPathRendering;
     friend class GrTextUtils;
     friend class GrGLPathRendering;
     friend class SkScalerContext;
     friend class SkTextToPathIter;
     friend class SkCanonicalizePaint;
 };
 
 #endif