Implement the Windows desktop search redirection feature.

components/search_engines/desktop_search_redirection_infobar_delegate.cc

+// Copyright 2016 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 "components/search_engines/desktop_search_redirection_infobar_delegate.h"
+
+#include <vector>
+
+#include "base/logging.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/metrics/histogram_macros.h"
+#include "base/metrics/user_metrics.h"
+#include "base/prefs/pref_service.h"
+#include "components/infobars/core/infobar.h"
+#include "components/infobars/core/infobar_delegate.h"
+#include "components/infobars/core/infobar_manager.h"
+#include "components/search_engines/desktop_search_utils.h"
+#include "grit/components_strings.h"
+#include "ui/base/l10n/l10n_util.h"
+#include "ui/base/window_open_disposition.h"
+
+namespace {
+
+// Values for the Search.DesktopSearch.RedirectionInfobarCloseAction histogram.
+enum DesktopSearchRedirectionInfobarCloseAction {
+  DESKTOP_SEARCH_REDIRECTION_INFOBAR_CLOSE_ACTION_MANAGE_SEARCH_SETTINGS = 0,
+  DESKTOP_SEARCH_REDIRECTION_INFOBAR_CLOSE_ACTION_DISMISS = 1,
+  DESKTOP_SEARCH_REDIRECTION_INFOBAR_CLOSE_ACTION_IGNORE = 2,
+  DESKTOP_SEARCH_REDIRECTION_INFOBAR_CLOSE_ACTION_MAX
+};
+
+void RecordDesktopSearchInfobarCloseActionHistogram(
+    DesktopSearchRedirectionInfobarCloseAction action) {
+  DCHECK_LT(action, DESKTOP_SEARCH_REDIRECTION_INFOBAR_CLOSE_ACTION_MAX);
+  UMA_HISTOGRAM_ENUMERATION(
+      "Search.DesktopSearch.RedirectionInfobarCloseAction", action,
+      DESKTOP_SEARCH_REDIRECTION_INFOBAR_CLOSE_ACTION_MAX);
+}
+
+}  // namespace
+
+void DesktopSearchRedirectionInfobarDelegate::Show(
+    infobars::InfoBarManager* infobar_manager,
+    const base::string16& default_search_engine_name,
+    const base::Closure& manage_search_settings_callback,
+    PrefService* pref_service) {
+  DCHECK(infobar_manager);
+  infobar_manager->AddInfoBar(
+      infobar_manager->CreateConfirmInfoBar(scoped_ptr<ConfirmInfoBarDelegate>(
+          new DesktopSearchRedirectionInfobarDelegate(
+              default_search_engine_name, manage_search_settings_callback))));
+  pref_service->SetBoolean(prefs::kDesktopSearchRedirectionInfobarShownPref,
+                           true);
+

[Peter Kasting, 2016/01/22 00:38:57]

Nit: No need for this blank line.

[fdoray, 2016/02/01 15:15:53]

Done.

+  base::RecordAction(
+      base::UserMetricsAction("DesktopSearchRedirectionInfoBar_Shown"));
+}
+
+DesktopSearchRedirectionInfobarDelegate::
+    DesktopSearchRedirectionInfobarDelegate(
+        const base::string16& default_search_engine_name,
+        const base::Closure& manage_search_settings_callback)
+    : default_search_engine_name_(default_search_engine_name),
+      manage_search_settings_callback_(manage_search_settings_callback),
+      closed_by_user_(false) {}
+
+DesktopSearchRedirectionInfobarDelegate::
+    ~DesktopSearchRedirectionInfobarDelegate() {
+  if (!closed_by_user_) {
+    base::RecordAction(
+        base::UserMetricsAction("DesktopSearchRedirectionInfoBar_Ignore"));
+    RecordDesktopSearchInfobarCloseActionHistogram(
+        DESKTOP_SEARCH_REDIRECTION_INFOBAR_CLOSE_ACTION_IGNORE);
+  }
+}
+
+infobars::InfoBarDelegate::InfoBarIdentifier
+DesktopSearchRedirectionInfobarDelegate::GetIdentifier() const {
+  return DESKTOP_SEARCH_REDIRECTION_INFOBAR_DELEGATE;
+}
+
+void DesktopSearchRedirectionInfobarDelegate::InfoBarDismissed() {
+  base::RecordAction(
+      base::UserMetricsAction("DesktopSearchRedirectionInfoBar_Dismiss"));
+  RecordDesktopSearchInfobarCloseActionHistogram(
+      DESKTOP_SEARCH_REDIRECTION_INFOBAR_CLOSE_ACTION_DISMISS);
+  closed_by_user_ = true;
+}
+
+base::string16 DesktopSearchRedirectionInfobarDelegate::GetMessageText() const {
+  return l10n_util::GetStringFUTF16(
+      IDS_DESKTOP_SEARCH_REDIRECTION_INFOBAR_MESSAGE,
+      default_search_engine_name_);
+}
+
+int DesktopSearchRedirectionInfobarDelegate::GetButtons() const {
+  return BUTTON_OK;
+}
+
+base::string16 DesktopSearchRedirectionInfobarDelegate::GetButtonLabel(
+    InfoBarButton button) const {
+  return l10n_util::GetStringUTF16(
+      IDS_DESKTOP_SEARCH_REDIRECTION_INFOBAR_BUTTON);
+}
+
+bool DesktopSearchRedirectionInfobarDelegate::Accept() {
+  base::RecordAction(base::UserMetricsAction(
+      "DesktopSearchRedirectionInfoBar_ManageSearchSettings"));
+  RecordDesktopSearchInfobarCloseActionHistogram(

[Peter Kasting, 2016/01/22 00:38:57]

Nit: I'd probably put this statement down just under the "Close the infobar"
comment, since it's specifically about "closing" and not just the manage search
settings button.

At that point, you could probably remove the blank line between RecordAction()
and running the callback, since those two things seem closely related.

[fdoray, 2016/02/01 15:15:53]

Done.

+      DESKTOP_SEARCH_REDIRECTION_INFOBAR_CLOSE_ACTION_MANAGE_SEARCH_SETTINGS);
+
+  manage_search_settings_callback_.Run();
+
+  // Close the infobar.
+  closed_by_user_ = true;
+  return true;
+}