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This CL marks clipboard suggestions and query tile suggestions as
special suggestions, skip them for search vs url partitions.
So clipboard suggestion can on top of search suggestions.

This CL partial revert
https://chromium-review.googlesource.com/c/chromium/src/+/2259380
because search type suggestion needs to have keyword, but image search
is different with other search suggestion, cannot have keyword. So in
this CL, we create a special category for clipboard and query tile,
and skip them for search vs url partitions.

Bug:1091952

Change-Id: I454b5774602c4da9f8f0907bc570ad84be9e0a1d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2266012
Commit-Queue: Gang Wu <gangwu@chromium.org>
Reviewed-by: Tommy Li <tommycli@chromium.org>
Reviewed-by: Ender <ender@google.com>
Cr-Commit-Position: refs/heads/master@{#782759}