[CrOS SplitSettings] Open all chrome://os-settings in standalone surface

With the exception of typing "chrome://os-settings" (or any subpages)
into the url bar, any navigation to OS Settings or its subpages
should open the standalone chrome OS settings surface.

Bug: 990540
Change-Id: I6b868d4f96c045b536afa5e2426f01fe216fd0f1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1747071
Commit-Queue: Regan Hsu <hsuregan@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: Michael Wasserman <msw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#687351}

chrome/browser/ui/browser_navigator.cc

@@ -51,6 +51,8 @@
 #if defined(OS_CHROMEOS)
 #include "ash/public/cpp/multi_user_window_manager.h"
 #include "chrome/browser/ui/ash/multi_user/multi_user_window_manager_helper.h"
+#include "chrome/browser/ui/settings_window_manager_chromeos.h"
+#include "chromeos/constants/chromeos_features.h"
 #include "components/account_id/account_id.h"
 #endif
 
@@ -521,7 +523,23 @@ void Navigate(NavigateParams* params) {
     return;
   }
 #if defined(OS_CHROMEOS)
-  if (source_browser && source_browser != params->browser) {
+  if (source_browser) {
+    // If OS Settings is accessed in any means other than explicitly typing the
+    // URL into the URL bar, open OS Settings in its own standalone surface.
+    if (chromeos::features::IsSplitSettingsEnabled() &&
+        params->url.host() == chrome::kChromeUIOSSettingsHost &&
+        !PageTransitionCoreTypeIs(params->transition,
+                                  ui::PageTransition::PAGE_TRANSITION_TYPED)) {
+      chrome::SettingsWindowManager* settings_window_manager =
+          chrome::SettingsWindowManager::GetInstance();
+      if (!settings_window_manager->IsSettingsBrowser(source_browser)) {
+        settings_window_manager->ShowChromePageForProfile(
+            GetSourceProfile(params), params->url);
+        return;
+      }
+    }
+
+    if (source_browser != params->browser) {
       // When the newly created browser was spawned by a browser which visits
       // another user's desktop, it should be shown on the same desktop as the
       // originating one. (This is part of the desktop separation per profile).
@@ -542,6 +560,7 @@ void Navigate(NavigateParams* params) {
         }
       }
     }
+  }
 #endif
 
   // Navigate() must not return early after this point.

chrome/browser/ui/browser_navigator_browsertest_chromeos.cc

@@ -5,6 +5,7 @@
 #include "ash/public/cpp/window_pin_type.h"
 #include "ash/public/cpp/window_properties.h"
 #include "base/command_line.h"
+#include "base/test/scoped_feature_list.h"
 #include "chrome/browser/chromeos/login/chrome_restart_request.h"
 #include "chrome/browser/ui/ash/multi_user/multi_user_util.h"
 #include "chrome/browser/ui/ash/multi_user/multi_user_window_manager_helper.h"
@@ -22,6 +23,7 @@
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/webui_url_constants.h"
 #include "chrome/test/base/ui_test_utils.h"
+#include "chromeos/constants/chromeos_features.h"
 #include "chromeos/constants/chromeos_switches.h"
 #include "components/account_id/account_id.h"
 #include "content/public/browser/notification_service.h"
@@ -37,6 +39,49 @@ GURL GetGoogleURL() {
 
 using BrowserNavigatorTestChromeOS = BrowserNavigatorTest;
 
+// Verifies that the OS settings page opens in a standalone surface when
+// accessed via link or url.
+IN_PROC_BROWSER_TEST_F(BrowserNavigatorTestChromeOS, NavigateToOSSettings) {
+  // Enable SplitSettings feature.
+  base::test::ScopedFeatureList scoped_feature_list;
+  scoped_feature_list.InitAndEnableFeature(chromeos::features::kSplitSettings);
+
+  // Install the Settings App.
+  web_app::WebAppProvider::Get(browser()->profile())
+      ->system_web_app_manager()
+      .InstallSystemAppsForTesting();
+
+  // Verify that only one window is upon before navigating to OS settings.
+  EXPECT_EQ(1u, chrome::GetTotalBrowserCount());
+
+  // Navigate to OS Settings page via typing URL into URL bar.
+  NavigateParams params(MakeNavigateParams(browser()));
+  params.url = GURL("chrome://os-settings/");
+  params.transition = ui::PageTransition::PAGE_TRANSITION_TYPED;
+  Navigate(&params);
+
+  // Verify that navigating to chrome://os-settings/ via typing causes the
+  // browser itself to navigate to the OS Settings page.
+  EXPECT_EQ(1u, chrome::GetTotalBrowserCount());
+  EXPECT_EQ(GURL("chrome://os-settings/"),
+            browser()->tab_strip_model()->GetActiveWebContents()->GetURL());
+
+  // Navigate to OS Settings page via clicking a link on another page.
+  params.transition = ui::PageTransition::PAGE_TRANSITION_LINK;
+  Navigate(&params);
+  Browser* os_settings_browser =
+      chrome::SettingsWindowManager::GetInstance()->FindBrowserForProfile(
+          browser()->profile());
+
+  // Verify that navigating to chrome://os-settings/ via a link from another
+  // page opens a standalone surface.
+  EXPECT_EQ(2u, chrome::GetTotalBrowserCount());
+  EXPECT_EQ(
+      GURL("chrome://os-settings/"),
+      os_settings_browser->tab_strip_model()->GetActiveWebContents()->GetURL());
+  EXPECT_NE(browser(), os_settings_browser);
+}
+
 // This test verifies that the settings page is opened in a new browser window.
 IN_PROC_BROWSER_TEST_F(BrowserNavigatorTestChromeOS, NavigateToSettings) {
   // Install the Settings App.

chrome/browser/ui/settings_window_manager_chromeos.cc

@@ -5,8 +5,10 @@
 #include "chrome/browser/ui/settings_window_manager_chromeos.h"
 
 #include "ash/public/cpp/app_types.h"
+#include "ash/public/cpp/multi_user_window_manager.h"
 #include "ash/public/cpp/resources/grit/ash_public_unscaled_resources.h"
 #include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/ui/ash/multi_user/multi_user_window_manager_helper.h"
 #include "chrome/browser/ui/ash/window_properties.h"
 #include "chrome/browser/ui/browser_finder.h"
 #include "chrome/browser/ui/browser_navigator.h"
@@ -26,6 +28,21 @@
 
 namespace chrome {
 
+namespace {
+
+// This method handles the case of resurfacing the user's OS Settings
+// standalone window that may be at the time located on another user's desktop.
+void ShowSettingsOnCurrentDesktop(Browser* browser) {
+  auto* window_manager = MultiUserWindowManagerHelper::GetWindowManager();
+  if (window_manager && browser) {
+    window_manager->ShowWindowForUser(browser->window()->GetNativeWindow(),
+                                      window_manager->CurrentAccountId());
+    browser->window()->Show();
+  }
+}
+
+}  // namespace
+
 // static
 SettingsWindowManager* SettingsWindowManager::GetInstance() {
   return base::Singleton<SettingsWindowManager>::get();
@@ -54,6 +71,7 @@ void SettingsWindowManager::ShowChromePageForProfile(Profile* profile,
     bool did_create;
     Browser* browser = web_app::LaunchSystemWebApp(
         profile, web_app::SystemAppType::SETTINGS, gurl, &did_create);
+    ShowSettingsOnCurrentDesktop(browser);
     // Only notify if we created a new browser.
     if (!did_create || !browser)
       return;