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We want to count the number of searches from various access points in Chrome. To do this, we've added a new UMA enumerated histogram to track these values (GoogleSearch.AccessPoint). These are the necessary declarations for various search access points that will be added shortly.

We've also added a IsGoogleSearchUrl helper to google_util to identify search URLs.

BUG=
TEST=Ensure that unit tests GoogleUtilTest all succeed.


Review URL: http://codereview.chromium.org/9452039

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@124587 0039d316-1c4b-4281-b951-d872f2087c98