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This CL adds eg2 tests for changes in crrev.com/c/2140953.

The test fixture in this CL must enable certain command-line flags
to be able to run the managed bookmarks enterprise policy.

The eg2 tests for managed bookmarks include testing:
- disabling long-press for managed items (URLs and folders)
- disabling swipe-to-delete for managed items (URLs and folders)
- disabling new folder context menu button when inside a managed folder
- disabling edit context menu button when inside a managed folder

Bug: 1065187
Change-Id: Ide92b87f03585d186b133f192d1e39a4fbbaa1cd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2145260Reviewed-by: Sergio Collazos <sczs@chromium.org>
Commit-Queue: edchin <edchin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758848}