Make "source" a required argument of AppLaunchParams and fill in the argument in all call points.

chrome/browser/ui/webui/extensions/extension_settings_handler.cc

 // Copyright (c) 2012 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/ui/webui/extensions/extension_settings_handler.h"
 
 #include "apps/app_load_service.h"
 #include "apps/saved_files_service.h"
 #include "base/auto_reset.h"
 #include "base/base64.h"
@@ skipping 31 matching lines @@
 #include "chrome/browser/extensions/updater/extension_updater.h"
 #include "chrome/browser/extensions/webstore_reinstaller.h"
 #include "chrome/browser/platform_util.h"
 #include "chrome/browser/prefs/incognito_mode_prefs.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/tab_contents/background_contents.h"
 #include "chrome/browser/ui/apps/app_info_dialog.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_finder.h"
 #include "chrome/browser/ui/browser_window.h"
+#include "chrome/browser/ui/extensions/app_launch_params.h"
 #include "chrome/browser/ui/extensions/application_launch.h"
 #include "chrome/browser/ui/webui/extensions/extension_basic_info.h"
 #include "chrome/browser/ui/webui/extensions/extension_icon_source.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/chrome_version_info.h"
 #include "chrome/common/extensions/features/feature_channel.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/common/url_constants.h"
 #include "chrome/grit/chromium_strings.h"
 #include "chrome/grit/generated_resources.h"
@@ skipping 960 matching lines @@
 
 void ExtensionSettingsHandler::HandleLaunchMessage(
     const base::ListValue* args) {
   CHECK_EQ(1U, args->GetSize());
   std::string extension_id;
   CHECK(args->GetString(0, &extension_id));
   const Extension* extension =
       extension_service_->GetExtensionById(extension_id, false);
   OpenApplication(AppLaunchParams(extension_service_->profile(), extension,
                                   extensions::LAUNCH_CONTAINER_WINDOW,
-                                  NEW_WINDOW));
+                                  NEW_WINDOW,
+                                  extensions::SOURCE_EXTENSIONS_PAGE));
 }
 
 void ExtensionSettingsHandler::HandleReloadMessage(
     const base::ListValue* args) {
   std::string extension_id = base::UTF16ToUTF8(ExtractStringValue(args));
   CHECK(!extension_id.empty());
   extension_service_->ReloadExtensionWithQuietFailure(extension_id);
 }
 
 void ExtensionSettingsHandler::HandleRepairMessage(
@@ skipping 471 matching lines @@
     extension_service_->EnableExtension(extension_id);
   } else {
     ExtensionErrorReporter::GetInstance()->ReportError(
         base::UTF8ToUTF16(JoinString(requirement_errors, ' ')),
         true);  // Be noisy.
   }
   requirements_checker_.reset();
 }
 
 }  // namespace extensions