Add SkRRect::transform.

include/core/SkRRect.h

Index: include/core/SkRRect.h
diff --git a/include/core/SkRRect.h b/include/core/SkRRect.h
index 32d62856bc90fddec1a33196f8f691ce8506de68..77e109d45b948eff171ac1373247e5b60fb6dae1 100644
--- a/include/core/SkRRect.h
+++ b/include/core/SkRRect.h
@@ -12,6 +12,7 @@
 #include "SkPoint.h"
 
 class SkPath;
+class SkMatrix;
 
 // Path forward:
 //   core work
@@ -277,6 +278,17 @@ public:
      */
     uint32_t readFromMemory(const void* buffer);
 
+    /**
+     *  Transform by the specified matrix, and put the result in dst.
+     *
+     *  @param matrix SkMatrix specifying the transform. Must only contain
+     *      scale and/or translate, or this call will fail.

[robertphillips, 2013/10/30 23:55:02]

this is a const method?! Are we really going to alter this?

[scroggo, 2013/10/31 17:40:35]

This seemed like an odd pattern to me, but I was keeping it consistent with
SkPath::transform. SkPath::transform is overloaded to include a non-const
version to modify self, but if you call path.transform(matrix, &path) or
path.transform(matrix, NULL) (using the const function) it will modify the path
as well.

+     *  @param dst SkRRect to store the result. If NULL, the transform will
+     *      be performed on this.
+     *  @return true on success, false on failure. If false, dst is unmodified.
+     */
+    bool transform(const SkMatrix& matrix, SkRRect* dst) const;
+
 private:
     SkRect fRect;
     // Radii order is UL, UR, LR, LL. Use Corner enum to index into fRadii[]