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This CL starts to implement the glue code in bookmark_bridge.cc, it
loads the reading list folder in bookmark root page.

Bug: 1128074
Change-Id: Ib3259e8c799242f033cd5778876df9211c3f6cf2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2441319
Commit-Queue: Xing Liu <xingliu@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Reviewed-by: Brandon Wylie <wylieb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814095}