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This CL adds search capability to read later bookmarks. This enables
read later items to be searchable from anywhere inside bookmarks.

Bug: 1139072
Change-Id: I13329f066d300be1e1a70ddd51f42908b8454749
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2536813
Commit-Queue: Shakti Sahu <shaktisahu@chromium.org>
Reviewed-by: Brandon Wylie <wylieb@chromium.org>
Reviewed-by: Theresa  <twellington@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827935}