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

chrome/browser/ui/extensions/app_launch_params.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_EXTENSIONS_APP_LAUNCH_PARAMS_H_
 #define CHROME_BROWSER_UI_EXTENSIONS_APP_LAUNCH_PARAMS_H_
 
 #include <string>
 
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "chrome/browser/ui/host_desktop.h"
 #include "chrome/common/extensions/extension_constants.h"
 #include "extensions/common/constants.h"
 #include "ui/base/window_open_disposition.h"
 #include "ui/gfx/rect.h"
 #include "url/gurl.h"
 
 class Profile;
 
 namespace extensions {
 class Extension;
 }
 
 struct AppLaunchParams {
   AppLaunchParams(Profile* profile,
                   const extensions::Extension* extension,
                   extensions::LaunchContainer container,
-                  WindowOpenDisposition disposition);
+                  WindowOpenDisposition disposition,
+                  extensions::AppLaunchSource source);
 
   // Helper to create AppLaunchParams using extensions::GetLaunchContainer with
   // LAUNCH_TYPE_REGULAR to check for a user-configured container.
   AppLaunchParams(Profile* profile,
                   const extensions::Extension* extension,
-                  WindowOpenDisposition disposition);
+                  WindowOpenDisposition disposition,
+                  extensions::AppLaunchSource source);
 
   // Helper to create AppLaunchParams using event flags that allows user to
   // override the user-configured container using modifier keys, falling back to
   // extensions::GetLaunchContainer() with no modifiers. |desktop_type|
   // indicates the desktop upon which to launch (Ash or Native).
   AppLaunchParams(Profile* profile,
                   const extensions::Extension* extension,
-                  int event_flags,
-                  chrome::HostDesktopType desktop_type);
+                  WindowOpenDisposition disposition,
+                  chrome::HostDesktopType desktop_type,
+                  extensions::AppLaunchSource source);
 
   ~AppLaunchParams();
 
   // The profile to load the application from.
   Profile* profile;
 
   // The extension to load.
   std::string extension_id;
 
   // The container type to launch the application in.
@@ skipping 19 matching lines @@
   // If non-empty, the current directory from which any relative paths on the
   // command line should be expanded from.
   base::FilePath current_directory;
 
   // Record where the app is launched from for tracking purpose.
   // Different app may have their own enumeration of sources.
   extensions::AppLaunchSource source;
 };
 
 #endif  // CHROME_BROWSER_UI_EXTENSIONS_APP_LAUNCH_PARAMS_H_