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To analyze the impact of prefetching high-confidence search suggestions in Android Chrome, this CL,
- Adds a listener for counting Google searches from various search access points. No actual search query content is observed.
- Records the search count based on the prerendering settings.

(see trybot results in patchset #8).

BUG=382694
R=asvitkine@chromium.org, davidben@chromium.org, jam@chromium.org, pkasting@chromium.org, samarth@chromium.org

Review URL: https://codereview.chromium.org/342053002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@278835 0039d316-1c4b-4281-b951-d872f2087c98