make most of SkColorPriv.h private

created new file src/core/SkColorData.h for
internal consumption. Note that many of the
functions there are unused as well.

Bug: skia: 6898
R: reed@google.com
Change-Id: I25bfd5a9c21f53558c4ca65a77eb5d322d897c6d
Reviewed-on: https://skia-review.googlesource.com/46848
Commit-Queue: Cary Clark <caryclark@google.com>
Reviewed-by: Mike Reed <reed@google.com>
diff --git a/tests/ReadPixelsTest.cpp b/tests/ReadPixelsTest.cpp
index ce01004..a296c46 100644
--- a/tests/ReadPixelsTest.cpp
+++ b/tests/ReadPixelsTest.cpp
@@ -6,7 +6,7 @@
  */
 
 #include "SkCanvas.h"
-#include "SkColorPriv.h"
+#include "SkColorData.h"
 #include "SkColorSpace_Base.h"
 #include "SkHalf.h"
 #include "SkImageInfoPriv.h"