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Prior to this CL, only the search provider debounced requests. This CL
introduces AutocompleteProviderDebouncer which can be reused by other providers.

Debouncing doc provider is behind a feature "OmniboxDebounceDocumentProvider"
and configured by the params "DebounceDocumentProviderFromLastRun" and
"DebounceDocumentProviderDelayMs".

Bug: 1015820, 864302
Change-Id: I397a29848e8d1abde3c8ecdaec91cef2e416e37a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1869393Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Commit-Queue: manuk hovanesian <manukh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709084}