Launch first run dialog on macOS

Fix brave/brave-browser#12679

app/brave_generated_resources.grd

@@ -1033,6 +1033,12 @@ By installing this extension, you are agreeing to the Google Widevine Terms of U
       <message name="IDS_SETTINGS_RESET_REWARDS_DATA" desc="The label for opening rewards manage wallet dialog">
         Reset Brave Rewards data...
       </message>
+      <!--First-run dialog messages -->
+      <if expr="is_macosx">
+        <message name="IDS_FIRSTRUN_DLG_MAC_OPTIONS_SEND_USAGE_STATS_LABEL_BRAVE" desc="Label for checkbox to ask whether to send usage stats to Google">
+          Help improve <ph name="PRODUCT_NAME">$1<ex>Brave</ex></ph> by sending crash reports and completely anonymised, private product analytics.
+        </message>
+      </if>
     </messages>
   </release>
 </grit>

chromium_src/chrome/browser/first_run/first_run_internal_posix.cc

@@ -0,0 +1,39 @@
+/* Copyright (c) 2020 The Brave Authors. All rights reserved.
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "chrome/browser/first_run/first_run_internal.h"
+
+#include "base/files/file_path.h"
+#include "base/files/file_util.h"
+#include "base/no_destructor.h"
+#include "base/path_service.h"
+#include "build/branding_buildflags.h"
+#include "build/build_config.h"
+#include "chrome/browser/browser_process.h"
+#include "chrome/browser/first_run/first_run.h"
+#include "chrome/browser/first_run/first_run_dialog.h"
+#include "chrome/browser/metrics/metrics_reporting_state.h"
+#include "chrome/common/chrome_constants.h"
+#include "chrome/common/chrome_paths.h"
+#include "chrome/common/chrome_switches.h"
+#include "chrome/installer/util/google_update_settings.h"
+#include "chrome/installer/util/initial_preferences.h"
+#include "components/metrics/metrics_pref_names.h"
+#include "components/metrics/metrics_reporting_default_state.h"
+#include "components/prefs/pref_service.h"
+#include "components/startup_metric_utils/browser/startup_metric_utils.h"
+
+// All above headers copied from original first_run_internal_posix.cc are
+// included to prevent below GOOGLE_CHROEM_BUILD affect them.
+
+// First run dialog is only enabled for google chrome by default.
+#if defined(OFFICIAL_BUILD) && defined(OS_MAC)
+#undef BUILDFLAG_INTERNAL_GOOGLE_CHROME_BRANDING
+#define BUILDFLAG_INTERNAL_GOOGLE_CHROME_BRANDING() (1)
+#endif
+#include "../../../../../chrome/browser/first_run/first_run_internal_posix.cc"
+#if defined(OFFICIAL_BUILD) && defined(OS_MAC)
+#undef BUILDFLAG_INTERNAL_GOOGLE_CHROME_BRANDING
+#endif

chromium_src/chrome/browser/ui/cocoa/first_run_dialog.mm

@@ -0,0 +1,55 @@
+/* Copyright (c) 2020 The Brave Authors. All rights reserved.
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "brave/components/p3a/buildflags.h"
+#include "chrome/browser/browser_process.h"
+#include "components/prefs/pref_service.h"
+
+#if BUILDFLAG(BRAVE_P3A_ENABLED)
+#include "brave/components/p3a/pref_names.h"
+#endif
+
+#define ShowFirstRunDialog ShowFirstRunDialog_UnUsed
+#include "../../../../../../chrome/browser/ui/cocoa/first_run_dialog.mm"
+#undef ShowFirstRunDialog
+
+namespace {
+
+// Copied ShowFirstRunModal from upstream and p3a prefs part added.
+void ShowFirstRunModalBrave(Profile* profile) {
+  base::scoped_nsobject<FirstRunDialogController> dialog(
+      [[FirstRunDialogController alloc] init]);
+
+  [dialog.get() showWindow:nil];
+
+  // If the dialog asked the user to opt-in for stats and crash reporting,
+  // record the decision and enable the crash reporter if appropriate.
+  bool consent_given = [dialog.get() isStatsReportingEnabled];
+  ChangeMetricsReportingState(consent_given);
+
+#if BUILDFLAG(BRAVE_P3A_ENABLED)
+  PrefService* local_state = g_browser_process->local_state();
+  local_state->SetBoolean(brave::kP3AEnabled, consent_given);
+#endif
+
+  // If selected, set as default browser. Skip in automated tests so that an OS
+  // dialog confirming the default browser choice isn't left on screen.
+  BOOL make_default_browser =
+      [dialog.get() isMakeDefaultBrowserEnabled] &&
+      !base::CommandLine::ForCurrentProcess()->HasSwitch(switches::kTestType);
+  if (make_default_browser) {
+    bool success = shell_integration::SetAsDefaultBrowser();
+    DCHECK(success);
+  }
+}
+}  // namespace
+
+namespace first_run {
+
+void ShowFirstRunDialog(Profile* profile) {
+  ShowFirstRunModalBrave(profile);
+}
+
+}  // namespace first_run

chromium_src/chrome/browser/ui/cocoa/first_run_dialog_controller.mm

@@ -0,0 +1,17 @@
+/* Copyright (c) 2020 The Brave Authors. All rights reserved.
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "brave/grit/brave_generated_resources.h"
+#include "chrome/grit/generated_resources.h"
+
+// Replaced string here instead of by running 'npm run chromium_rebase_l10n'
+// because string replacement failed with string that include place holder like
+// <ph name="PRODUCT_NAME">$1<ex>Brave</ex></ph>. I assume this include some
+// special charactors.
+#undef IDS_FIRSTRUN_DLG_MAC_OPTIONS_SEND_USAGE_STATS_LABEL
+#define IDS_FIRSTRUN_DLG_MAC_OPTIONS_SEND_USAGE_STATS_LABEL \
+  IDS_FIRSTRUN_DLG_MAC_OPTIONS_SEND_USAGE_STATS_LABEL_BRAVE
+#include "../../../../../../chrome/browser/ui/cocoa/first_run_dialog_controller.mm"
+#undef IDS_FIRSTRUN_DLG_MAC_OPTIONS_SEND_USAGE_STATS_LABEL