Move SkImage::encode to SkImageEncoder

src/image/SkImage.cpp

Index: src/image/SkImage.cpp
diff --git a/src/image/SkImage.cpp b/src/image/SkImage.cpp
index f11900dcaa29e7fa748d70f5c641280081bb383d..c710efc89db73b39127ee805fefa190e7dfbd2a1 100644
--- a/src/image/SkImage.cpp
+++ b/src/image/SkImage.cpp
@@ -83,12 +83,8 @@ SkShader* SkImage::newShader(SkShader::TileMode tileX,
     return as_IB(this)->onNewShader(tileX, tileY, localMatrix);
 }
 
-SkData* SkImage::encode(SkImageEncoder::Type type, int quality) const {
-    SkBitmap bm;
-    if (as_IB(this)->getROPixels(&bm)) {
-        return SkImageEncoder::EncodeData(bm, type, quality);
-    }
-    return NULL;
+bool SkImage::getBitmapForEncoding(SkBitmap* bm) const {
+    return as_IB(this)->getROPixels(bm);
 }
 
 ///////////////////////////////////////////////////////////////////////////////