Add an API to set the ColorFilter on a Paint object.

sky/engine/core/painting/ColorFilter.cpp

Index: sky/engine/core/painting/ColorFilter.cpp
diff --git a/sky/engine/core/painting/ColorFilter.cpp b/sky/engine/core/painting/ColorFilter.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..964fe3d57d4e3269cd992bd70067c8d1e38b2f89
--- /dev/null
+++ b/sky/engine/core/painting/ColorFilter.cpp
@@ -0,0 +1,25 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "sky/engine/config.h"
+#include "sky/engine/core/painting/ColorFilter.h"
+
+namespace blink {
+
+// static
+PassRefPtr<ColorFilter> ColorFilter::create(unsigned color,
+                                            unsigned transfer_mode) {
+  return adoptRef(new ColorFilter(adoptRef(SkColorFilter::CreateModeFilter(
+      static_cast<SkColor>(color),
+      static_cast<SkXfermode::Mode>(transfer_mode)))));
+}
+
+ColorFilter::ColorFilter(PassRefPtr<SkColorFilter> filter)
+    : filter_(filter) {
+}
+
+ColorFilter::~ColorFilter() {
+}
+
+} // namespace blink