Add whitelist parameter to refEncodedData

src/gpu/SkGrPriv.h

Index: src/gpu/SkGrPriv.h
diff --git a/src/gpu/SkGrPriv.h b/src/gpu/SkGrPriv.h
index 46be3a53cfb0b322ab5832ac3867c338dc9fd46d..d9e6178421cfbd869e72dc16d2d97e8b7101d6d8 100644
--- a/src/gpu/SkGrPriv.h
+++ b/src/gpu/SkGrPriv.h
@@ -10,6 +10,7 @@
 
 #include "GrTypes.h"
 #include "GrBlend.h"
+#include "SkEncodedFormat.h"
 #include "SkImageInfo.h"
 #include "SkMatrix.h"
 #include "SkXfermode.h"
@@ -105,6 +106,22 @@ GrSurfaceDesc GrImageInfoToSurfaceDesc(const SkImageInfo&, const GrCaps&);
 bool GrPixelConfig2ColorAndProfileType(GrPixelConfig, SkColorType*, SkColorProfileType*);
 
 /**
+ *  Returns true if the specified encoded format might be supported on this GPU.
+ */
+bool GrIsCompressedFormatPossiblySupported(GrContext*, SkEncodedFormat);
+
+/**
+ *  Sniffs the provided data, and returns true if it might be supported by the gpu.
+ *  If the format is not recognized, this returns false.
+ *
+ *  Note: it is possible that even if true is returned, that the gpu may fail to actually support
+ *        it as a texture, once the width/height are considered.
+ *
+ *  See GrIsCompressedTextureDataPossiblySupported()
+ */
+bool GrIsCompressedTextureDataPossiblySupported(GrContext* ctx, const void* data, size_t size);
+
+/**
  *  If the compressed data in the SkData is supported (as a texture format, this returns
  *  the pixel-config that should be used, and sets outStartOfDataToUpload to the ptr into
  *  the data where the actual raw data starts (skipping any header bytes).