Add bitmap manipulation functions in advance of themes.

skia/ext/skia_utils.h

Index: skia/ext/skia_utils.h
===================================================================
--- skia/ext/skia_utils.h	(revision 13970)
+++ skia/ext/skia_utils.h	(working copy)
@@ -21,6 +21,12 @@
                                SkColor start_color,
                                SkColor end_color);
 
+// Convert a premultiplied SkColor to a HSL value.
+void SkColorToHSL(SkColor c, float hsl[3]);

[brettw, 2009/04/28 02:49:43]

Since the colors are premultiplied, you should use SkPMColor here, below, and in
image_operations internally when you read the values. That way the
premultiplication aspect of it (which is fine) is self-documenting and
type-checked.

+
+// Convert a HSL color to a premultiplied SkColor.
+SkColor HSLToSKColor(U8CPU alpha, float hsl[3]);
+
 }  // namespace skia
 
 #endif  // SKIA_EXT_SKIA_UTILS_H_