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

chrome/browser/apps/ephemeral_app_launcher.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/apps/ephemeral_app_launcher.h"
 
 #include "base/command_line.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/extensions/extension_install_checker.h"
 #include "chrome/browser/extensions/extension_install_prompt.h"
 #include "chrome/browser/extensions/extension_util.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser_navigator.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/scoped_tabbed_browser_displayer.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/extensions/manifest_handlers/app_launch_info.h"
 #include "content/public/browser/web_contents.h"
 #include "extensions/browser/extension_prefs.h"
 #include "extensions/browser/extension_registry.h"
 #include "extensions/browser/extension_system.h"
 #include "extensions/browser/management_policy.h"
+#include "extensions/common/constants.h"
 #include "extensions/common/permissions/permissions_data.h"
 
 using content::WebContents;
 using extensions::Extension;
 using extensions::ExtensionInstallChecker;
 using extensions::ExtensionPrefs;
 using extensions::ExtensionRegistry;
 using extensions::ExtensionSystem;
 using extensions::ManagementPolicy;
 using extensions::WebstoreInstaller;
@@ skipping 235 matching lines @@
   }
 
   InvokeCallback(result, error);
 }
 
 void EphemeralAppLauncher::LaunchApp(const Extension* extension) const {
   DCHECK(extension && extension->is_app() &&
          ExtensionRegistry::Get(profile())
              ->GetExtensionById(extension->id(), ExtensionRegistry::ENABLED));
 
-  AppLaunchParams params(profile(), extension, NEW_FOREGROUND_TAB);
+  AppLaunchParams params(profile(), extension, NEW_FOREGROUND_TAB,
+                         extensions::SOURCE_EPHEMERAL);
   params.desktop_type =
       chrome::GetHostDesktopTypeForNativeWindow(parent_window_);
   OpenApplication(params);
 }
 
 bool EphemeralAppLauncher::LaunchHostedApp(const Extension* extension) const {
   GURL launch_url = extensions::AppLaunchInfo::GetLaunchWebURL(extension);
   if (!launch_url.is_valid())
     return false;
 
@@ skipping 165 matching lines @@
 
   // CompleteInstall will call Release.
   WebstoreStandaloneInstaller::CompleteInstall(webstore_install::SUCCESS,
                                                std::string());
 }
 
 void EphemeralAppLauncher::ExtensionEnableFlowAborted(bool user_initiated) {
   // CompleteInstall will call Release.
   CompleteInstall(webstore_install::USER_CANCELLED, kUserCancelledError);
 }