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

chrome/browser/ui/ash/launcher/chrome_launcher_controller.cc

 // Copyright 2013 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/ash/launcher/chrome_launcher_controller.h"
 
 #include <vector>
 
 #include "ash/ash_switches.h"
 #include "ash/desktop_background/desktop_background_controller.h"
@@ skipping 38 matching lines @@
 #include "chrome/browser/ui/ash/launcher/launcher_app_tab_helper.h"
 #include "chrome/browser/ui/ash/launcher/launcher_item_controller.h"
 #include "chrome/browser/ui/ash/multi_user/multi_user_util.h"
 #include "chrome/browser/ui/ash/multi_user/multi_user_window_manager.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_commands.h"
 #include "chrome/browser/ui/browser_finder.h"
 #include "chrome/browser/ui/browser_list.h"
 #include "chrome/browser/ui/browser_tabstrip.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/extensions/extension_enable_flow.h"
 #include "chrome/browser/ui/host_desktop.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/browser/web_applications/web_app.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/extensions/manifest_handlers/app_launch_info.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/common/url_constants.h"
 #include "chrome/grit/generated_resources.h"
@@ skipping 658 matching lines @@
     extension_enable_flow_->StartForNativeWindow(NULL);
     return;
   }
 
 #if defined(OS_WIN)
   if (LaunchedInNativeDesktop(app_id))
     return;
 #endif
 
   // The app will be created for the currently active profile.
-  AppLaunchParams params(profile_,
-                         extension,
-                         event_flags,
-                         chrome::HOST_DESKTOP_TYPE_ASH);
+  AppLaunchParams params(profile_, extension, event_flags,
+                         chrome::HOST_DESKTOP_TYPE_ASH,
+                         extensions::SOURCE_APP_LAUNCHER);
   if (source != ash::LAUNCH_FROM_UNKNOWN &&
       app_id == extensions::kWebStoreAppId) {
     // Get the corresponding source string.
     std::string source_value = GetSourceFromAppListSource(source);
 
     // Set an override URL to include the source.
     GURL extension_url = extensions::AppLaunchInfo::GetFullLaunchURL(extension);
     params.override_url = net::AppendQueryParameter(
         extension_url, extension_urls::kWebstoreSourceField, source_value);
   }
 
-  params.source = (source == ash::LAUNCH_FROM_UNKNOWN)
-                      ? extensions::SOURCE_UNTRACKED
-                      : extensions::SOURCE_APP_LAUNCHER;
-
   OpenApplication(params);
 }
 
 void ChromeLauncherController::ActivateApp(const std::string& app_id,
                                            ash::LaunchSource source,
                                            int event_flags) {
   // If there is an existing non-shortcut controller for this app, open it.
   ash::ShelfID id = GetShelfIDForAppID(app_id);
   if (id) {
     LauncherItemController* controller = GetLauncherItemController(id);
@@ skipping 1364 matching lines @@
 void ChromeLauncherController::ReleaseProfile() {
   if (app_sync_ui_state_)
     app_sync_ui_state_->RemoveObserver(this);
 
   extensions::ExtensionRegistry::Get(profile_)->RemoveObserver(this);
 
   PrefServiceSyncable::FromProfile(profile_)->RemoveObserver(this);
 
   pref_change_registrar_.RemoveAll();
 }