Make savelayer_* GM be 565 friendly

Change-Id: I0594d9e8d2495643a404bddee61d7f01c7c0103c
Reviewed-on: https://skia-review.googlesource.com/7263
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
diff --git a/gm/savelayer.cpp b/gm/savelayer.cpp
index 8f2d5c8..e35ccc9 100644
--- a/gm/savelayer.cpp
+++ b/gm/savelayer.cpp
@@ -22,7 +22,7 @@
     SkRandom rand;
 
     for (int i = 0; i < 20; ++i) {
-        paint.setColor(rand.nextU() | (0xFF << 24));
+        paint.setColor(sk_tool_utils::color_to_565(rand.nextU() | (0xFF << 24)));
         canvas->drawRect({ 15, 15, 290, 40 }, paint);
         canvas->translate(0, 30);
     }