Settings reset prompt: Fetch default settings only when needed.

chrome/browser/safe_browsing/settings_reset_prompt/settings_reset_prompt_controller.cc

 // Copyright 2017 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/safe_browsing/settings_reset_prompt/settings_reset_prompt_controller.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/location.h"
 #include "base/logging.h"
+#include "base/memory/ptr_util.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/metrics/user_metrics.h"
 #include "base/metrics/user_metrics_action.h"
 #include "base/time/time.h"
+#include "chrome/browser/profile_resetter/brandcoded_default_settings.h"
+#include "chrome/browser/profile_resetter/profile_resetter.h"
 #include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/safe_browsing/settings_reset_prompt/default_settings_fetcher.h"
 #include "chrome/browser/safe_browsing/settings_reset_prompt/settings_reset_prompt_config.h"
 #include "chrome/browser/safe_browsing/settings_reset_prompt/settings_reset_prompt_model.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_finder.h"
 #include "chrome/browser/ui/browser_window.h"
 #include "chrome/grit/chromium_strings.h"
 #include "chrome/grit/generated_resources.h"
 #include "components/url_formatter/elide_url.h"
 #include "content/public/browser/browser_thread.h"
 #include "ui/base/l10n/l10n_util.h"
@@ skipping 16 matching lines @@
 bool ResetStartupUrlsEnabled(const SettingsResetPromptModel& model) {
   return model.startup_urls_reset_state() ==
          SettingsResetPromptModel::RESET_REQUIRED;
 }
 
 bool ResetHomepageEnabled(const SettingsResetPromptModel& model) {
   return model.homepage_reset_state() ==
          SettingsResetPromptModel::RESET_REQUIRED;
 }
 
-// Function that is passed the newly created |SettingsResetPromptModel| object
-// as a result of a call to |MaybeShowSettingsResetPrompt()| below. Will display
-// the settings reset prompt if required by the model and there is at least one
-// non-incognito browser available for the corresponding profile.
-void OnModelCreated(std::unique_ptr<SettingsResetPromptModel> model) {
-  if (!model)
-    return;
-
-  model->ReportUmaMetrics();
-
-  if (!model->ShouldPromptForReset())
-    return;
-
-  Profile* profile = model->profile();
+void TryToShowSettingsResetPrompt(
+    std::unique_ptr<SettingsResetPromptModel> model,
+    std::unique_ptr<BrandcodedDefaultSettings> default_settings) {
+  DCHECK(model);
+  DCHECK(default_settings);
 
   // Ensure that there is at least one non-incognito browser open for the
   // profile before attempting to show the dialog.
-  Browser* browser =
-      chrome::FindTabbedBrowser(profile, /*match_original_profiles=*/false);
+  Browser* browser = chrome::FindTabbedBrowser(
+      model->profile(), /*match_original_profiles=*/false);
   if (!browser)
     return;
 
   // First, show the browser window, and only then show the dialog so that the
   // dialog will have focus.
   if (browser->window()->IsMinimized())
     browser->window()->Restore();
   browser->window()->Show();
 
   // The |SettingsResetPromptController| object will delete itself after the
   // reset prompt dialog has been closed.
   SettingsResetPromptController::ShowSettingsResetPrompt(
-      browser, new SettingsResetPromptController(std::move(model)));
+      browser, new SettingsResetPromptController(std::move(model),
+                                                 std::move(default_settings)));
 }
 
+// Will display the settings reset prompt if required and if there is at least
+// one non-incognito browser available for the corresponding profile.
 void MaybeShowSettingsResetPrompt(
     std::unique_ptr<SettingsResetPromptConfig> config) {
   DCHECK(config);
 
   Browser* browser = chrome::FindLastActive();
   if (!browser)
     return;
 
   // Get the original profile in case the last active browser was incognito. We
   // ensure that there is at least one non-incognito browser open before
   // displaying the dialog.
   Profile* profile = browser->profile()->GetOriginalProfile();
-  SettingsResetPromptModel::Create(profile, std::move(config),
-                                   base::Bind(OnModelCreated));
+
+  auto model = base::MakeUnique<SettingsResetPromptModel>(
+      profile, std::move(config), base::MakeUnique<ProfileResetter>(profile));
+
+  model->ReportUmaMetrics();
+
+  if (!model->ShouldPromptForReset())
+    return;
+
+  DefaultSettingsFetcher::FetchDefaultSettings(
+      base::Bind(&TryToShowSettingsResetPrompt, base::Passed(&model)));
 }
 
 }  // namespace.
 
 SettingsResetPromptController::SettingsResetPromptController(
-    std::unique_ptr<SettingsResetPromptModel> model)
-    : model_(std::move(model)) {
+    std::unique_ptr<SettingsResetPromptModel> model,
+    std::unique_ptr<BrandcodedDefaultSettings> default_settings)
+    : model_(std::move(model)), default_settings_(std::move(default_settings)) {
   DCHECK(model_);
   DCHECK(model_->ShouldPromptForReset());
+  DCHECK(default_settings_);
+
   // In the current implementation of the reset dialog, we ask users to reset
   // one settings type. If more than one setting requires reset, the model will
   // choose which setting we should prompt the user for.
   DCHECK_EQ(1, int{ResetSearchEnabled(*model_)} +
                    int{ResetStartupUrlsEnabled(*model_)} +
                    int{ResetHomepageEnabled(*model_)});
 
   InitMainText();
 }
 
@@ skipping 31 matching lines @@
 
 void SettingsResetPromptController::DialogShown() {
   model_->DialogShown();
   time_dialog_shown_ = base::Time::Now();
   base::RecordAction(base::UserMetricsAction("SettingsResetPrompt_Shown"));
   UMA_HISTOGRAM_BOOLEAN("SettingsResetPrompt.DialogShown", true);
 }
 
 void SettingsResetPromptController::Accept() {
   DCHECK(!time_dialog_shown_.is_null());
+  DCHECK(default_settings_);
+
   base::RecordAction(base::UserMetricsAction("SettingsResetPrompt_Accepted"));
   UMA_HISTOGRAM_LONG_TIMES_100("SettingsResetPrompt.TimeUntilAccepted",
                                base::Time::Now() - time_dialog_shown_);
   UMA_HISTOGRAM_BOOLEAN("SettingsResetPrompt.PromptAccepted", true);
   model_->PerformReset(
+      std::move(default_settings_),
       base::Bind(&SettingsResetPromptController::OnInteractionDone,
                  base::Unretained(this)));
 }
 
 void SettingsResetPromptController::Cancel() {
   DCHECK(!time_dialog_shown_.is_null());
   base::RecordAction(base::UserMetricsAction("SettingsResetPrompt_Canceled"));
   UMA_HISTOGRAM_LONG_TIMES_100("SettingsResetPrompt.TimeUntilCanceled",
                                base::Time::Now() - time_dialog_shown_);
   UMA_HISTOGRAM_BOOLEAN("SettingsResetPrompt.PromptAccepted", false);
@@ skipping 74 matching lines @@
     return;
 
   base::TimeDelta delay = config->delay_before_prompt();
   content::BrowserThread::PostDelayedTask(
       content::BrowserThread::UI, FROM_HERE,
       base::BindOnce(MaybeShowSettingsResetPrompt, base::Passed(&config)),
       delay);
 }
 
 }  // namespace safe_browsing