Update button color.

Test: nope
PiperOrigin-RevId: 198596861
Change-Id: Ibc2cccdcb7b02b5ba8b79f5429babc9028f282d8
diff --git a/java/com/android/incallui/answer/impl/res/drawable/shape_chip_drawable.xml b/java/com/android/incallui/answer/impl/res/drawable/shape_chip_drawable.xml
index 0cf4897..adb153f 100644
--- a/java/com/android/incallui/answer/impl/res/drawable/shape_chip_drawable.xml
+++ b/java/com/android/incallui/answer/impl/res/drawable/shape_chip_drawable.xml
@@ -29,7 +29,7 @@
   </item>
   <item>
     <shape xmlns:android="http://schemas.android.com/apk/res/android">
-      <solid android:color="?android:attr/colorBackgroundFloating"/>
+      <solid android:color="#FFFFFF"/>
       <stroke
           android:width="1dp"
           android:color="#DADCE0"/>
@@ -41,4 +41,4 @@
       <corners android:radius="40dp"/>
     </shape>
   </item>
-</ripple>
\ No newline at end of file
+</ripple>