Add SkColorSpaceXform to the public API

src/codec/SkCodecPriv.h

 /*
  * Copyright 2015 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkCodecPriv_DEFINED
 #define SkCodecPriv_DEFINED
 
@@ skipping 158 matching lines @@
         case kBGRA_8888_SkColorType:
             return colorPtr[fillIndex];
         case kRGB_565_SkColorType:
             return SkPixel32ToPixel16(colorPtr[fillIndex]);
         case kIndex_8_SkColorType:
             return fillIndex;
         case kRGBA_F16_SkColorType: {
             SkASSERT(colorXform);
             uint64_t dstColor;
             uint32_t srcColor = colorPtr[fillIndex];
-            colorXform->apply(&dstColor, &srcColor, 1, select_xform_format(dstColorType),
-                              SkColorSpaceXform::kRGBA_8888_ColorFormat, alphaType);
+            SkAssertResult(colorXform->apply(select_xform_format(dstColorType), &dstColor,
+                    SkColorSpaceXform::kRGBA_8888_ColorFormat, &srcColor, 1, alphaType));
             return dstColor;
         }
         default:
             SkASSERT(false);
             return 0;
     }
 }
 
 /*
  *
@@ skipping 202 matching lines @@
             return kOpaque_SkAlphaType == src.alphaType() && !needs_color_xform(dst, src);
         case kGray_8_SkColorType:
             return kGray_8_SkColorType == src.colorType() &&
                    kOpaque_SkAlphaType == src.alphaType() && !needs_color_xform(dst, src);
         default:
             return false;
     }
 }
 
 #endif // SkCodecPriv_DEFINED