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Add Java PeekConditions class and equivalent C++ struct.
Parse AutoPeekConditions and plumb from fetch through to bridge.
Create and use ContextualSuggestionsResult to encapsulate all response data.
Add contextual_suggestions_test_utils and move common test code there.

Change-Id: I5cd8eb83c6a321377924bf14a2e71d2fefd9b98c
Reviewed-on: https://chromium-review.googlesource.com/1034015
Commit-Queue: Patrick Noland <pnoland@chromium.org>
Reviewed-by: Filip Gorski <fgorski@chromium.org>
Reviewed-by: Theresa <twellington@chromium.org>
Cr-Commit-Position: refs/heads/master@{#555261}