Enable profile switching for standalone App Launcher via the Settings App.

chrome/browser/ui/webui/options/manage_profile_handler.cc

Index: chrome/browser/ui/webui/options/manage_profile_handler.cc
diff --git a/chrome/browser/ui/webui/options/manage_profile_handler.cc b/chrome/browser/ui/webui/options/manage_profile_handler.cc
index 25481b144b9798e11336a0bf070f172e8bc5f77f..103519cd3f3296a1d09b40128b4f659bc8146d66 100644
--- a/chrome/browser/ui/webui/options/manage_profile_handler.cc
+++ b/chrome/browser/ui/webui/options/manage_profile_handler.cc
@@ -27,6 +27,11 @@
 #include "content/public/browser/web_ui.h"
 #include "grit/generated_resources.h"
 
+#if defined(ENABLE_SETTINGS_APP)
+#include "chrome/browser/ui/app_list/app_list_util.h"
+#include "content/public/browser/web_contents.h"
+#endif
+
 namespace options {
 
 namespace {
@@ -113,6 +118,11 @@ void ManageProfileHandler::RegisterMessages() {
   web_ui()->RegisterMessageCallback("profileIconSelectionChanged",
       base::Bind(&ManageProfileHandler::ProfileIconSelectionChanged,
                  base::Unretained(this)));
+#if defined(ENABLE_SETTINGS_APP)
+  web_ui()->RegisterMessageCallback("profilesAppListSwitch",
+      base::Bind(&ManageProfileHandler::ProfilesAppListSwitch,
+                 base::Unretained(this)));
+#endif
 }
 
 void ManageProfileHandler::Observe(
@@ -309,6 +319,24 @@ void ManageProfileHandler::DeleteProfile(const ListValue* args) {
       profile_file_path, desktop_type);
 }
 
+#if defined(ENABLE_SETTINGS_APP)
+void ManageProfileHandler::ProfilesAppListSwitch(const ListValue* args) {
+  DCHECK(args);
+  if (!ProfileManager::IsMultipleProfilesEnabled())

[sail, 2013/01/23 16:55:24]

The profile switch UI shouldn't be shown if multi-profiles is disabled.
This should be a DCHECK() instead.

[koz (OOO until 15th September), 2013/01/25 00:32:46]

Done.

+    return;
+
+  const Value* file_path_value;
+  FilePath profile_file_path;
+  if (!args->Get(0, &file_path_value) ||
+      !base::GetValueAsFilePath(*file_path_value, &profile_file_path))
+    return;
+
+  chrome::SetAppListProfile(profile_file_path);
+  // Close the settings app, since it will now be for the wrong profile.
+  web_ui()->GetWebContents()->Close();
+}
+#endif  // else !defined(ENABLE_SETTINGS_APP)
+
 void ManageProfileHandler::ProfileIconSelectionChanged(
     const base::ListValue* args) {
   DCHECK(args);