Update menu look and feel on Android

chrome/android/java/src/org/chromium/chrome/browser/appmenu/AppMenu.java

 // Copyright 2011 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.chrome.browser.appmenu;
 
 import android.content.Context;
 import android.content.res.Resources;
 import android.graphics.Rect;
 import android.view.KeyEvent;
@@ skipping 47 matching lines @@
     AppMenu(Menu menu, int itemRowHeight, int itemDividerHeight, AppMenuHandler handler,
             Resources res) {
         mMenu = menu;
 
         mItemRowHeight = itemRowHeight;
         assert mItemRowHeight > 0;
 
         mHandler = handler;
 
         mItemDividerHeight = itemDividerHeight;
-        assert mItemDividerHeight > 0;
+        assert mItemDividerHeight >= 0;
 
         mAdditionalVerticalOffset = res.getDimensionPixelSize(R.dimen.menu_vertical_offset);
         mVerticalFadeDistance = res.getDimensionPixelSize(R.dimen.menu_vertical_fade_distance);
     }
 
     /**
      * Creates and shows the app menu anchored to the specified view.
      *
      * @param context             The context of the AppMenu (ensure the proper theme is set on
      *                            this context).
@@ skipping 13 matching lines @@
             @Override
             public void onDismiss() {
                 if (mPopup.getAnchorView() instanceof ImageButton) {
                     ((ImageButton) mPopup.getAnchorView()).setSelected(false);
                 }
                 mHandler.onMenuVisibilityChanged(false);
             }
         });
         mPopup.setWidth(context.getResources().getDimensionPixelSize(R.dimen.menu_width));
 
+        // Need to explicitly set the background here.  Relying on it being set in the style caused
+        // an incorrectly drawn background.
+        mPopup.setBackgroundDrawable(context.getResources().getDrawable(R.drawable.menu_bg));
+
         mCurrentScreenRotation = screenRotation;
         mIsByHardwareButton = isByHardwareButton;
 
         // Extract visible items from the Menu.
         int numItems = mMenu.size();
         List<MenuItem> menuItems = new ArrayList<MenuItem>();
         for (int i = 0; i < numItems; ++i) {
             MenuItem item = mMenu.getItem(i);
             if (item.isVisible()) {
                 menuItems.add(item);
@@ skipping 142 matching lines @@
                         padding.top + padding.bottom);
             } else {
                 mPopup.setHeight(spaceForFullItems - mItemRowHeight + spaceForPartialItem +
                         padding.top + padding.bottom);
             }
         } else {
             mPopup.setHeight(ViewGroup.LayoutParams.WRAP_CONTENT);
         }
     }
 }