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The new enhanced bookmark UI redefines what top folders are:
- Sub-folders of mobile node and others node.
- Desktop node.
- Managed bookmark node.
- Partner bookmark node.

So we need JNI bridge functions to query them.

BUG=386785

Review URL: https://codereview.chromium.org/516323003

Cr-Commit-Position: refs/heads/master@{#293291}