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

extensions/browser/api/app_runtime/app_runtime_api.cc

 // Copyright 2014 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 "extensions/browser/api/app_runtime/app_runtime_api.h"
 
 #include "base/metrics/histogram.h"
 #include "base/time/time.h"
 #include "base/values.h"
 #include "extensions/browser/event_router.h"
@@ skipping 73 matching lines @@
     case extensions::SOURCE_URL_HANDLER:
       return app_runtime::LAUNCH_SOURCE_URL_HANDLER;
 
     case extensions::SOURCE_SYSTEM_TRAY:
       return app_runtime::LAUNCH_SOURCE_SYSTEM_TRAY;
     case extensions::SOURCE_ABOUT_PAGE:
       return app_runtime::LAUNCH_SOURCE_ABOUT_PAGE;
     case extensions::SOURCE_KEYBOARD:
       return app_runtime::LAUNCH_SOURCE_KEYBOARD;
 
+    case extensions::SOURCE_SETTINGS_PAGE:
+      return app_runtime::LAUNCH_SOURCE_SETTINGS_PAGE;
+    case extensions::SOURCE_MANAGEMENT_API:
+      return app_runtime::LAUNCH_SOURCE_MANAGEMENT_API;
+    case extensions::SOURCE_EPHEMERAL:
+      return app_runtime::LAUNCH_SOURCE_EPHEMERAL;
+    case extensions::SOURCE_BACKGROUND:
+      return app_runtime::LAUNCH_SOURCE_BACKGROUND;
+    case extensions::SOURCE_KIOSK:
+      return app_runtime::LAUNCH_SOURCE_KIOSK;
+    case extensions::SOURCE_CHROME_INTERNAL:
+      return app_runtime::LAUNCH_SOURCE_CHROME_INTERNAL;
+
     default:
       return app_runtime::LAUNCH_SOURCE_NONE;
   }
 }
 
 }  // namespace
 
 // static
 void AppRuntimeEventRouter::DispatchOnEmbedRequestedEvent(
     content::BrowserContext* context,
@@ skipping 78 matching lines @@
   launch_data.url.reset(new std::string(url.spec()));
   launch_data.referrer_url.reset(new std::string(referrer_url.spec()));
   if (extensions::FeatureSwitch::trace_app_source()->IsEnabled()) {
     launch_data.source = source_enum;
   }
   DispatchOnLaunchedEventImpl(
       extension->id(), source_enum, launch_data.ToValue().Pass(), context);
 }
 
 }  // namespace extensions