Address some SkLightingShader TODOs

gm/lightingshader.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "gm.h"
 
 #include "SkColorPriv.h"
@@ skipping 87 matching lines @@
 }
 
 namespace skiagm {
 
 // This GM exercises lighting shaders.
 class LightingShaderGM : public GM {
 public:
     LightingShaderGM() {
         this->setBGColor(sk_tool_utils::color_to_565(0xFFCCCCCC));
 
-        fLight.fColor = SkColorSetRGB(0xff, 0xff, 0xff);
+        fLight.fColor = SkColor3f::Make(1.0f, 1.0f, 1.0f);
         fLight.fDirection.fX = 0.0f;
         fLight.fDirection.fY = 0.0f;
         fLight.fDirection.fZ = 1.0f;
 
-        fAmbient = SkColorSetRGB(0x1f, 0x1f, 0x1f);
+        fAmbient = SkColor3f::Make(0.1f, 0.1f, 0.1f);
     }
 
 protected:
 
     SkString onShortName() override {
         return SkString("lightingshader");
     }
 
     SkISize onISize() override {
         return SkISize::Make(kGMSize, kGMSize);
@@ skipping 40 matching lines @@
 
 private:
     static const int kTexSize = 128;
     static const int kGMSize  = 512;
 
     SkBitmap                fDiffuse;
     SkBitmap                fHemiNormalMap;
     SkBitmap                fFrustumNormalMap;
 
     SkLightingShader::Light fLight;
-    SkColor                 fAmbient;
+    SkColor3f               fAmbient;
 
     typedef GM INHERITED;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
 DEF_GM( return SkNEW(LightingShaderGM); )
 
 }