ButtonCompat: handle missing StateListAnimator gracefully.

ui/android/java/src/org/chromium/ui/widget/ButtonCompat.java

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.ui.widget;
 
 import android.animation.AnimatorInflater;
 import android.annotation.TargetApi;
 import android.content.Context;
 import android.content.res.ColorStateList;
@@ skipping 63 matching lines @@
 
         getBackground().mutate();
         setButtonColor(buttonColor);
 
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
             // Use the StateListAnimator from the Widget.Material.Button style to animate the
             // elevation when the button is pressed.
             TypedArray a = getContext().obtainStyledAttributes(null,
                     new int[]{android.R.attr.stateListAnimator}, 0,
                     android.R.style.Widget_Material_Button);
-            setStateListAnimator(AnimatorInflater.loadStateListAnimator(getContext(),
-                    a.getResourceId(0, 0)));
+            int stateListAnimatorId = a.getResourceId(0, 0);
             a.recycle();
+            // stateListAnimatorId could be 0 on custom or future builds of Android, or when using a
+            // framework like Xposed. Handle these cases gracefully by simply not using a
+            // StateListAnimator.
+            if (stateListAnimatorId != 0) {
+                setStateListAnimator(AnimatorInflater.loadStateListAnimator(getContext(),
+                        stateListAnimatorId));
+            }
         }
     }
 
     /**
      * Sets the background color of the button.
      */
     public void setButtonColor(int color) {
         if (color == mColor) return;
         mColor = color;
 
@@ skipping 47 matching lines @@
         return DISABLED_COLOR;
     }
 
     private static int getColorFromAttributeSet(Context context, AttributeSet attrs) {
         TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.ButtonCompat, 0, 0);
         int color = a.getColor(R.styleable.ButtonCompat_buttonColor, Color.WHITE);
         a.recycle();
         return color;
     }
 }