Use rounding when converting desiredScale to a sampleSize

dm/DM.cpp

Index: dm/DM.cpp
diff --git a/dm/DM.cpp b/dm/DM.cpp
index 7d8d610699ce40c365633a469c4e64274a498e7c..f47640899d6a43f6b02d62193ab3520735194d2e 100644
--- a/dm/DM.cpp
+++ b/dm/DM.cpp
@@ -311,7 +311,7 @@ static void push_codec_srcs(Path path) {
     // 0.1, 0.16, 0.2 etc allow us to test SkScaledCodec with sampleSize 10, 6, 5, etc.
     // 0.4, 0.7 etc allow to test what happens when the client requests a scale that
     // does not exactly match a sampleSize or native scaling capability.
-    const float samplingScales[] = { 0.1f, 0.125f, 0.166f, 0.2f, 0.25f, 0.333f, 0.375f, 0.4f, 0.5f,
+    const float samplingScales[] = { 0.1f, 0.125f, 0.167f, 0.2f, 0.25f, 0.333f, 0.375f, 0.4f, 0.5f,
             0.6f, 0.625f, 0.750f, 0.8f, 0.875f, 1.0f };
 
     for (float scale : samplingScales) {