[System Web Apps] Add default app list position for Settings SWAs.

This CL adds the default positions of the Settings and OS Settings PWAs.

Bug: 989833
Change-Id: I32a5400b87a810d4e06137c57d44ec1b0360427f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1728512
Auto-Submit: calamity <calamity@chromium.org>
Reviewed-by: Ben Wells <benwells@chromium.org>
Reviewed-by: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Commit-Queue: calamity <calamity@chromium.org>
Cr-Commit-Position: refs/heads/master@{#683482}

chrome/browser/chromeos/extensions/default_app_order.cc

@@ -63,6 +63,8 @@ const char* const kDefaultAppOrder[] = {
     app_list::kDefaultPageBreak1,  // First default page break
     extension_misc::kGoogleMapsAppId,
     app_list::kInternalAppIdSettings,
+    default_web_apps::kSettingsAppId,
+    default_web_apps::kOsSettingsAppId,
     app_list::kInternalAppIdDiscover,
     extension_misc::kGeniusAppId,
     extension_misc::kCalculatorAppId,

chrome/browser/chromeos/extensions/default_web_app_ids.h

@@ -24,6 +24,12 @@ constexpr char kCanvasAppId[] = "ieailfmhaghpphfffooibmlghaeopach";
 // "https://google.com/chromebook/whatsnew/embedded/")).
 constexpr char kReleaseNotesAppId[] = "kddjchdmnnpakappplfnloipgcbioilo";
 
+// Generated as web_app::GenerateAppIdFromURL(GURL("chrome://settings/")).
+constexpr char kSettingsAppId[] = "inogagmajamaleonmanpkpkkigmklfad";
+
+// Generated as web_app::GenerateAppIdFromURL(GURL("chrome://os-settings/")).
+constexpr char kOsSettingsAppId[] = "odknhmnlageboeamepcngndbggdpaobj";
+
 }  // namespace default_web_apps
 }  // namespace chromeos