added rounded corners & created file for rounded corners

chrome/android/java/src/org/chromium/chrome/browser/contextmenu/TabularContextMenuUi.java

Index: chrome/android/java/src/org/chromium/chrome/browser/contextmenu/TabularContextMenuUi.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/contextmenu/TabularContextMenuUi.java b/chrome/android/java/src/org/chromium/chrome/browser/contextmenu/TabularContextMenuUi.java
index 544036898eaebda58d2a9ffe086c244fc99c849d..5b74981ed36e7fa6a0d4975abfba89477117eaaa 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/contextmenu/TabularContextMenuUi.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/contextmenu/TabularContextMenuUi.java
@@ -55,8 +55,9 @@ public class TabularContextMenuUi implements ContextMenuUi, AdapterView.OnItemCl
             final Runnable onMenuShown, final Runnable onMenuClosed) {
         mCallback = onItemClicked;
         mDialog = createDialog(activity, params, items);
+
         mDialog.getWindow().setBackgroundDrawable(ApiCompatibilityUtils.getDrawable(
-                activity.getResources(), R.drawable.bg_find_toolbar_popup));
+                activity.getResources(), R.drawable.white_with_rounded_corners));
 
         mDialog.setOnShowListener(new DialogInterface.OnShowListener() {
             @Override
@@ -244,6 +245,7 @@ public class TabularContextMenuUi implements ContextMenuUi, AdapterView.OnItemCl
         if (itemGroups.size() <= 1) {
             tabLayout.setVisibility(View.GONE);
         }
+
         tabLayout.setupWithViewPager((ViewPager) view.findViewById(R.id.custom_pager));
 
         return view;