Adds per-provider information to omnibox UMA logs.

Adds a fairly general structure to omnibox logs that can be used to pass information (that's not per-result information) from providers to the UMA logs.  Right now it's only used to pass whether the asynchronous pass of a provider has finished, but it will probably be used for other things in the future.

BUG=
TEST=

Review URL: https://chromiumcodereview.appspot.com/10380007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@137288 0039d316-1c4b-4281-b951-d872f2087c98
bool AutocompleteResult::HasMatchByDestination(const AutocompleteMatch& match,
                                               const ACMatches& matches) {
  for (ACMatches::const_iterator i = matches.begin(); i != matches.end(); ++i) {
    if (i->destination_url == match.destination_url)
      return true;
  }
  return false;
}

bool AutocompleteResult::HasMatchByDestination(const AutocompleteMatch& match,
                                               const ACMatches& matches) {
  for (ACMatches::const_iterator i = matches.begin(); i != matches.end(); ++i) {
    if (i->destination_url == match.destination_url)
      return true;
  }
  return false;
}
