scaling API on SkPixmap

src/image/SkImage_Base.h

Index: src/image/SkImage_Base.h
diff --git a/src/image/SkImage_Base.h b/src/image/SkImage_Base.h
index 3fe3444aef976245979dd886349fe561dc2c077e..c91430e5bd4ca88b9dfcbb414bb09ec85ea6cb29 100644
--- a/src/image/SkImage_Base.h
+++ b/src/image/SkImage_Base.h
@@ -29,13 +29,13 @@ public:
 
     // Default impl calls onDraw
     virtual bool onReadPixels(const SkImageInfo& dstInfo, void* dstPixels, size_t dstRowBytes,
-                              int srcX, int srcY) const;
+                              int srcX, int srcY, CachingHint) const;
 
     virtual GrTexture* peekTexture() const { return nullptr; }
 
     // return a read-only copy of the pixels. We promise to not modify them,
     // but only inspect them (or encode them).
-    virtual bool getROPixels(SkBitmap*) const = 0;
+    virtual bool getROPixels(SkBitmap*, CachingHint = kAllow_CachingHint) const = 0;
 
     virtual SkImage* onApplyFilter(SkImageFilter*, SkIPoint* offset,
                                    bool forceResultToOriginalSize) const;