Add SkSourceGammaTreatment enum so we know how to create mips

include/gpu/SkGr.h

Index: include/gpu/SkGr.h
diff --git a/include/gpu/SkGr.h b/include/gpu/SkGr.h
index 6a73636c69047e26e70dbcd39127f378bd88c658..2fb5a76ef9e0bc702930db1d5d683b13ed5e9970 100644
--- a/include/gpu/SkGr.h
+++ b/include/gpu/SkGr.h
@@ -68,7 +68,8 @@ static inline GrColor SkPMColorToGrColor(SkPMColor c) {
 /** Returns a texture representing the bitmap that is compatible with the GrTextureParams. The
     texture is inserted into the cache (unless the bitmap is marked volatile) and can be
     retrieved again via this function. */
-GrTexture* GrRefCachedBitmapTexture(GrContext*, const SkBitmap&, const GrTextureParams&);
+GrTexture* GrRefCachedBitmapTexture(GrContext*, const SkBitmap&, const GrTextureParams&,
+                                    bool gammaCorrect);
 
 // TODO: Move SkImageInfo2GrPixelConfig to SkGrPriv.h (requires cleanup to SkWindow its subclasses).
 GrPixelConfig SkImageInfo2GrPixelConfig(SkColorType, SkAlphaType, SkColorProfileType, const GrCaps&);