Sky: Allow clients to specify tile mode for gradients (repeating or mirror).

sky/engine/core/painting/CanvasGradient.h

Index: sky/engine/core/painting/CanvasGradient.h
diff --git a/sky/engine/core/painting/CanvasGradient.h b/sky/engine/core/painting/CanvasGradient.h
index fed61ec3d7cd2efa943c099bac65bcdb21678777..8779eaa72aca3c16a5f4642a7f74f9ba003e1061 100644
--- a/sky/engine/core/painting/CanvasGradient.h
+++ b/sky/engine/core/painting/CanvasGradient.h
@@ -21,11 +21,13 @@ class CanvasGradient : public Shader {
 
   void initLinear(const Vector<Point>& end_points,
                   const Vector<SkColor>& colors,
-                  const Vector<float>& color_stops);
+                  const Vector<float>& color_stops,
+                  unsigned tile_mode);

[eseidel, 2015/06/09 17:45:22]

Why can't the C++ use an enum?

[Matt Perry, 2015/06/09 19:01:25]

It can, but then I'd have to write code to do the conversion. I figured that
since we have type safety on the Dart side, we don't need the extra code on the
C++ side. WDYT?

   void initRadial(const Point& center,
                   double radius,
                   const Vector<SkColor>& colors,
-                  const Vector<float>& color_stops);
+                  const Vector<float>& color_stops,
+                  unsigned tile_mode);
 
  private:
   CanvasGradient();