make tests portable by using 565 compatible colors

gm/gradients.cpp

 /*
  * Copyright 2011 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 "SkGradientShader.h"
 
@@ skipping 278 matching lines @@
 class ClampedGradientsGM : public GM {
 public:
     ClampedGradientsGM() {}
 
 protected:
     SkString onShortName() { return SkString("clamped_gradients"); }
 
     virtual SkISize onISize() { return SkISize::Make(640, 510); }
 
     void drawBG(SkCanvas* canvas) {
-        canvas->drawColor(0xFFDDDDDD);
+        canvas->drawColor(sk_tool_utils::color_to_565(0xFFDDDDDD));
     }
 
     virtual void onDraw(SkCanvas* canvas) {
         this->drawBG(canvas);
 
         SkRect r = { 0, 0, SkIntToScalar(100), SkIntToScalar(300) };
         SkPaint paint;
         paint.setAntiAlias(true);
 
         SkPoint center;
@@ skipping 144 matching lines @@
         paint.setShader(fShader);
         canvas->drawRect(SkRect::MakeWH(500, 500), paint);
     }
     
 private:
     typedef GM INHERITED;
 };
 DEF_GM( return new RadialGradient3GM; )
 
 }