Expanded Autofill Credit Card Popup Layout Experiment in Android.

ui/android/java/src/org/chromium/ui/DropdownDividerDrawable.java

 // Copyright 2014 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;
 
 import android.graphics.Canvas;
 import android.graphics.ColorFilter;
 import android.graphics.Paint;
 import android.graphics.PixelFormat;
 import android.graphics.Rect;
 import android.graphics.drawable.Drawable;
 
 class DropdownDividerDrawable extends Drawable {
 
-    private Paint mPaint;
-    private Rect mDividerRect;
+    private final Paint mPaint;
+    private final Rect mDividerRect;
+    private final Integer mBackgroundColor;
 
-    public DropdownDividerDrawable() {
+    /**
+     * Creates a drawable to draw a divider line that separates the list of {@link DropdownItem}
+     * and, optionally, paints the rectangular canvas.
+     * @param backgroundColor Popup background color. If {@code null}, does not paint the canvas.
+     */
+    public DropdownDividerDrawable(Integer backgroundColor) {
         mPaint = new Paint();
         mDividerRect = new Rect();
+        mBackgroundColor = backgroundColor;
     }
 
     @Override
     public void draw(Canvas canvas) {
+        if (mBackgroundColor != null) canvas.drawColor(mBackgroundColor);
         canvas.drawRect(mDividerRect, mPaint);
     }
 
     @Override
     public void onBoundsChange(Rect bounds) {
         mDividerRect.set(0, 0, bounds.width(), mDividerRect.height());
     }
 
     public void setHeight(int height) {
         mDividerRect.set(0, 0, mDividerRect.right, height);
     }
 
-    public void setColor(int color) {
+    public void setDividerColor(int color) {
         mPaint.setColor(color);
     }
 
     @Override
     public void setAlpha(int alpha) {
     }
 
     @Override
     public void setColorFilter(ColorFilter cf) {
     }
 
     @Override
     public int getOpacity() {
         return PixelFormat.TRANSPARENT;
     }
 }