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This CL makes new Suggestion metadata - headers - available to Java,
enabling subsequent work on Omnibox Suggestions List.

No processing of any kind takes place here. Suggestion headers should
be processed unconditionally as the feature will be enabled
server-side.

Bug: 1073671
Change-Id: I2e03e7cae1ca9ab54bf80798f2146ce499035ff3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2161319
Commit-Queue: Ender <ender@google.com>
Reviewed-by: Patrick Noland <pnoland@chromium.org>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Reviewed-by: Tommy Li <tommycli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#762158}