Make SkString movable.

This adds a move constructor and move assignment to SkString. This
allows elision of atomic increments and decrements on the fRec.

TBR=reed
Already agreed that moving is good.

Review URL: https://codereview.chromium.org/1672123002

1 files changed, 2 insertions, 0 deletions

diff --git a/include/core/SkString.h b/include/core/SkString.h
index 93514f2659..4625dd13cc 100644
--- a/include/core/SkString.h
+++ b/include/core/SkString.h
@@ -126,6 +126,7 @@ public:
     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; }
@@ -172,6 +173,7 @@ public:
     // these methods edit the string
 
     SkString& operator=(const SkString&);
+    SkString& operator=(SkString&&);
     SkString& operator=(const char text[]);
 
     char* writable_str();