Add SampleApp slide with animating lightmapped objects & transparency

include/core/SkLights.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 SkLights_DEFINED
 #define SkLights_DEFINED
@@ skipping 43 matching lines @@
     class Builder {
     public:
         Builder() : fLights(new SkLights) { }
     
         void add(const Light& light) {
             if (fLights) {
                 *fLights->fLights.push() = light;
             }
         }
 
-        const sk_sp<SkLights> finish() {
+        sk_sp<SkLights> finish() {
             return fLights;
         }
 
     private:
         sk_sp<SkLights> fLights;
     };
 
     int numLights() const {
         return fLights.count();
     }
 
     const Light& light(int index) const {
         return fLights[index];
     }
 
 private:
     SkLights() {}
 
     SkTDArray<Light> fLights;
 };
 
 #endif