Make use of new SkLights class

src/core/SkLight.h

-/*
- * Copyright 2015 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#ifndef SkLight_DEFINED
-#define SkLight_DEFINED
-
-#include "SkPoint3.h"
-
-class SK_API SkLight {
-public:
-    enum LightType {
-        kAmbient_LightType,       // only 'fColor' is used
-        kDirectional_LightType
-    };
-
-    SkLight() : fType(kAmbient_LightType) {
-        fColor.set(0.0f, 0.0f, 0.0f);
-        fDirection.set(0.0f, 0.0f, 1.0f);
-    }
-
-    SkLight(const SkColor3f& color)
-        : fType(kAmbient_LightType)
-        , fColor(color) {
-        fDirection.set(0.0f, 0.0f, 1.0f);
-    }
-
-    SkLight(const SkColor3f& color, const SkVector3& dir)
-        : fType(kDirectional_LightType)
-        , fColor(color)
-        , fDirection(dir) {
-        if (!fDirection.normalize()) {
-            fDirection.set(0.0f, 0.0f, 1.0f);
-        }
-    }
-
-    LightType type() const { return fType; }
-    const SkColor3f& color() const { return fColor; }
-    const SkVector3& dir() const {
-        SkASSERT(kAmbient_LightType != fType);
-        return fDirection;
-    }
-
-private:
-    LightType   fType;
-    SkColor3f   fColor;           // linear (unpremul) color. Range is 0..1 in each channel.
-    SkVector3   fDirection;       // direction towards the light (+Z is out of the screen).
-                                  // If degenerate, it will be replaced with (0, 0, 1).
-};
-
-
-#endif