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
void AutocompleteEditModel::SetInputInProgress(bool in_progress) {
  if (user_input_in_progress_ == in_progress)
    return;

  user_input_in_progress_ = in_progress;
  if (user_input_in_progress_)
    time_user_first_modified_omnibox_ = base::TimeTicks::Now();
  controller_->OnInputInProgress(in_progress);
}

void AutocompleteEditModel::SetInputInProgress(bool in_progress) {
  if (user_input_in_progress_ == in_progress)
    return;

  user_input_in_progress_ = in_progress;
  if (user_input_in_progress_)
    time_user_first_modified_omnibox_ = base::TimeTicks::Now();
  controller_->OnInputInProgress(in_progress);
}
