Use RenderThread for navigation bar ripples

Bug: 17506181
Change-Id: Icf3b80f8c4bc29fe85313381d4019dda3ef85ea9
diff --git a/packages/SystemUI/proguard.flags b/packages/SystemUI/proguard.flags
index c9e1618..47e24e8 100644
--- a/packages/SystemUI/proguard.flags
+++ b/packages/SystemUI/proguard.flags
@@ -1,8 +1,11 @@
 -keep class com.android.systemui.statusbar.policy.KeyButtonView {
   public float getDrawingAlpha();
+  public void setDrawingAlpha(float);
+}
+
+-keep class com.android.systemui.statusbar.policy.KeyButtonRipple {
   public float getGlowAlpha();
   public float getGlowScale();
-  public void setDrawingAlpha(float);
   public void setGlowAlpha(float);
   public void setGlowScale(float);
 }