some utils for rect and matrix

include/core/SkRect.h

Index: include/core/SkRect.h
diff --git a/include/core/SkRect.h b/include/core/SkRect.h
index 8d68c97febb730ec29bf694964bc4254a4b565c4..5c806a963b8bb39e7896ea3885b82611a63faf9a 100644
--- a/include/core/SkRect.h
+++ b/include/core/SkRect.h
@@ -162,17 +162,24 @@ struct SK_API SkIRect {
     /**
      *  Return a new IRect, built as an offset of this rect.
      */
-    SkIRect makeOffset(int dx, int dy) const {
+    SkIRect makeOffset(int32_t dx, int32_t dy) const {
         return MakeLTRB(fLeft + dx, fTop + dy, fRight + dx, fBottom + dy);
     }
 
     /**
      *  Return a new IRect, built as an inset of this rect.
      */
-    SkIRect makeInset(int dx, int dy) const {
+    SkIRect makeInset(int32_t dx, int32_t dy) const {
         return MakeLTRB(fLeft + dx, fTop + dy, fRight - dx, fBottom - dy);
     }
 
+    /**
+     *  Return a new Rect, built as an outset of this rect.
+     */
+    SkIRect makeOutset(int32_t dx, int32_t dy) const {
+        return MakeLTRB(fLeft - dx, fTop - dy, fRight + dx, fBottom + dy);
+    }
+
     /** Offset set the rectangle by adding dx to its left and right,
         and adding dy to its top and bottom.
     */
@@ -608,7 +615,7 @@ struct SK_API SkRect {
     SkRect makeOffset(SkScalar dx, SkScalar dy) const {
         return MakeLTRB(fLeft + dx, fTop + dy, fRight + dx, fBottom + dy);
     }
-
+    
     /**
      *  Return a new Rect, built as an inset of this rect.
      */
@@ -616,6 +623,13 @@ struct SK_API SkRect {
         return MakeLTRB(fLeft + dx, fTop + dy, fRight - dx, fBottom - dy);
     }
 
+    /**
+     *  Return a new Rect, built as an outset of this rect.
+     */
+    SkRect makeOutset(SkScalar dx, SkScalar dy) const {
+        return MakeLTRB(fLeft - dx, fTop - dy, fRight + dx, fBottom + dy);
+    }
+
     /** Offset set the rectangle by adding dx to its left and right,
         and adding dy to its top and bottom.
     */