Update colors for the round scroll bar.

Bug:32536003

Change-Id: I35503c089bc918493aab3288580f81d7b780d671
diff --git a/core/java/android/view/RoundScrollbarRenderer.java b/core/java/android/view/RoundScrollbarRenderer.java
index b77be8c..694232f 100644
--- a/core/java/android/view/RoundScrollbarRenderer.java
+++ b/core/java/android/view/RoundScrollbarRenderer.java
@@ -31,8 +31,8 @@
     private static final int MAX_SCROLLBAR_ANGLE_SWIPE = 16;
     private static final int MIN_SCROLLBAR_ANGLE_SWIPE = 6;
     private static final float WIDTH_PERCENTAGE = 0.02f;
-    private static final int DEFAULT_THUMB_COLOR = 0xFF757575;
-    private static final int DEFAULT_TRACK_COLOR = 0x21FFFFFF;
+    private static final int DEFAULT_THUMB_COLOR = 0x4CFFFFFF;
+    private static final int DEFAULT_TRACK_COLOR = 0x26FFFFFF;
 
     private final Paint mThumbPaint = new Paint();
     private final Paint mTrackPaint = new Paint();