[App banners] Add UMA metrics

chrome/browser/android/banners/app_banner_utilities.cc

-// Copyright 2014 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "chrome/browser/android/banners/app_banner_utilities.h"
-
-#include <algorithm>
-#include <string>
-
-#include "base/metrics/histogram.h"
-#include "chrome/browser/android/banners/app_banner_metrics_ids.h"
-
-namespace banners {
-
-void TrackDismissEvent(int event) {
-  std::vector<int> codes;
-  for (int i = DISMISS_MIN + 1; i < DISMISS_MAX; ++i) {
-    codes.push_back(i);
-  }
-  DCHECK(std::find(codes.begin(), codes.end(), event) != codes.end());
-  UMA_HISTOGRAM_CUSTOM_ENUMERATION("AppBanners.DismissEvent", event, codes);
-}
-
-void TrackDisplayEvent(int event) {
-  std::vector<int> codes;
-  for (int i = DISPLAY_MIN + 1; i < DISPLAY_MAX; ++i) {
-    codes.push_back(i);
-  }
-  DCHECK(std::find(codes.begin(), codes.end(), event) != codes.end());
-  UMA_HISTOGRAM_CUSTOM_ENUMERATION("AppBanners.DisplayEvent", event, codes);
-}
-
-void TrackInstallEvent(int event) {
-  std::vector<int> codes;
-  for (int i = INSTALL_MIN + 1; i < INSTALL_MAX; ++i) {
-    codes.push_back(i);
-  }
-  DCHECK(std::find(codes.begin(), codes.end(), event) != codes.end());
-  UMA_HISTOGRAM_CUSTOM_ENUMERATION("AppBanners.InstallEvent", event, codes);
-}
-
-}  // namespace banners