make tests portable by using 565 compatible colors

gm/repeated_bitmap.cpp

Index: gm/repeated_bitmap.cpp
diff --git a/gm/repeated_bitmap.cpp b/gm/repeated_bitmap.cpp
index e6b06365e6724d2b297073cd49fcbeb683d0f872..bda368b738448ed59aaf2aa74df216004e9f1805 100644
--- a/gm/repeated_bitmap.cpp
+++ b/gm/repeated_bitmap.cpp
@@ -10,7 +10,8 @@
 #include "Resources.h"
 
 DEF_SIMPLE_GM(repeated_bitmap, canvas, 576, 576) {
-    sk_tool_utils::draw_checkerboard(canvas, 0xFF999999, SK_ColorWHITE, 12);
+    sk_tool_utils::draw_checkerboard(canvas, sk_tool_utils::color_to_565(0xFF999999),
+            SK_ColorWHITE, 12);
     SkRect rect = SkRect::MakeLTRB(-4.25f, -4.25f, 4.25f, 4.25f);
     SkPaint paint;
     paint.setColor(0xFF333333);
@@ -31,7 +32,8 @@ DEF_SIMPLE_GM(repeated_bitmap, canvas, 576, 576) {
 }
 
 DEF_SIMPLE_GM(repeated_bitmap_jpg, canvas, 576, 576) {
-    sk_tool_utils::draw_checkerboard(canvas, 0xFF999999, SK_ColorWHITE, 12);
+    sk_tool_utils::draw_checkerboard(canvas, sk_tool_utils::color_to_565(0xFF999999),
+            SK_ColorWHITE, 12);
     SkRect rect = SkRect::MakeLTRB(-68.0f, -68.0f, 68.0f, 68.0f);
     SkPaint paint;
     paint.setColor(0xFF333333);