Log a warning rather than an info when setting background on a MaterialButton.

PiperOrigin-RevId: 239880506

Author: gsajith

lib/java/com/google/android/material/button/MaterialButton.java

@@ -351,7 +351,9 @@ public void setBackgroundResource(@DrawableRes int backgroundResourceId) {
   public void setBackgroundDrawable(Drawable background) {
     if (isUsingOriginalBackground()) {
       if (background != this.getBackground()) {
-        Log.i(LOG_TAG, "Setting a custom background is not supported.");
+        Log.w(
+            LOG_TAG,
+            "Do not set the background; MaterialButton manages its own background drawable.");
         materialButtonHelper.setBackgroundOverwritten();
         super.setBackgroundDrawable(background);
       } else {