Add capability for SkColorXform to output half floats

bench/ColorCodecBench.cpp

Index: bench/ColorCodecBench.cpp
diff --git a/bench/ColorCodecBench.cpp b/bench/ColorCodecBench.cpp
index 9dde5da813595fa6aa21ea4fe639dff2b5e53c92..edad759860ccd351cf8b6fead2fea81a5471cae4 100644
--- a/bench/ColorCodecBench.cpp
+++ b/bench/ColorCodecBench.cpp
@@ -61,7 +61,7 @@ void ColorCodecBench::decodeAndXform() {
         codec->getScanlines(fSrc.get(), 1, 0);
         SkASSERT(1 == rows);
 
-        xform->xform_RGB1_8888((uint32_t*) dst, (uint32_t*) fSrc.get(), fInfo.width());
+        xform->applyTo8888((SkPMColor*) dst, (uint32_t*) fSrc.get(), fInfo.width());
         dst = SkTAddOffset<void>(dst, fInfo.minRowBytes());
     }
 }
@@ -116,7 +116,7 @@ void ColorCodecBench::xformOnly() {
     void* src = fSrc.get();
     for (int y = 0; y < fInfo.height(); y++) {
         // Transform in place
-        xform->xform_RGB1_8888((uint32_t*) dst, (uint32_t*) src, fInfo.width());
+        xform->applyTo8888((SkPMColor*) dst, (uint32_t*) src, fInfo.width());
         dst = SkTAddOffset<void>(dst, fInfo.minRowBytes());
         src = SkTAddOffset<void>(src, fInfo.minRowBytes());
     }