Move all knowledge of X sampling into SkScaledCodec

src/codec/SkBmpRLECodec.h

Index: src/codec/SkBmpRLECodec.h
diff --git a/src/codec/SkBmpRLECodec.h b/src/codec/SkBmpRLECodec.h
index ea2c2b6babd8a3a076c71fafbd68cfb206e29577..8721969a857a3a3afa9892c8109af42ddbdc6ab5 100644
--- a/src/codec/SkBmpRLECodec.h
+++ b/src/codec/SkBmpRLECodec.h
@@ -8,6 +8,7 @@
 #include "SkBmpCodec.h"
 #include "SkColorTable.h"
 #include "SkImageInfo.h"
+#include "SkSampler.h"
 #include "SkTypes.h"
 
 /*
@@ -39,6 +40,8 @@ public:
             uint32_t offset, SkCodec::SkScanlineOrder rowOrder,
             size_t RLEBytes);
 
+    int setSampleX(int);
+
 protected:
 
     Result onGetPixels(const SkImageInfo& dstInfo, void* dst,
@@ -84,6 +87,8 @@ private:
     Result decodeRows(const SkImageInfo& dstInfo, void* dst, size_t dstRowBytes,
                       const Options& opts) override;
 
+    SkSampler* getSampler() override;
+
     SkAutoTUnref<SkColorTable>          fColorTable;    // owned
     const uint32_t                      fNumColors;
     const uint32_t                      fBytesPerColor;
@@ -92,6 +97,7 @@ private:
     size_t                              fRLEBytes;
     uint32_t                            fCurrRLEByte;
     int                                 fSampleX;
+    SkAutoTDelete<SkSampler>            fSampler;
 
     typedef SkBmpCodec INHERITED;
 };