Added support to blimp to be usable as a default browser

blimp/client/app/android/java/res/layout/toolbar_popup_item.xml

Index: blimp/client/app/android/java/res/layout/toolbar_popup_item.xml
diff --git a/chrome/android/java/res/layout/bookmark_popup_item.xml b/blimp/client/app/android/java/res/layout/toolbar_popup_item.xml
similarity index 77%
copy from chrome/android/java/res/layout/bookmark_popup_item.xml
copy to blimp/client/app/android/java/res/layout/toolbar_popup_item.xml
index 3c918d4c092432adf9860810d1302a3147638ae9..28d1dab52305602e610e72787556a9b804fbc6e3 100644
--- a/chrome/android/java/res/layout/bookmark_popup_item.xml
+++ b/blimp/client/app/android/java/res/layout/toolbar_popup_item.xml
@@ -7,6 +7,7 @@
     android:layout_width="match_parent"
     android:layout_height="?android:attr/listPreferredItemHeightSmall"
     android:paddingStart="?android:attr/listPreferredItemPaddingLeft"
-    android:textColor="@color/dark_mode_tint"
     android:gravity="center_vertical"
-    android:textSize="16sp" />
+    android:background="@color/default_white_background"
+    android:textColor="@color/default_dark_text_color"
+    android:textSize="16sp" />