Add a new field "source" in launchData of chrome.app.runtime.onLaunched() to trace launch source.

extensions/browser/api/app_runtime/app_runtime_api.h

 // 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.
 
 #ifndef EXTENSIONS_BROWSER_API_APP_RUNTIME_APP_RUNTIME_API_H_
 #define EXTENSIONS_BROWSER_API_APP_RUNTIME_APP_RUNTIME_API_H_
 
 #include <string>
 #include <vector>
 
 #include "base/memory/scoped_ptr.h"
+#include "extensions/common/constants.h"
 
 class GURL;
 
 namespace base {
 class DictionaryValue;
 }
 
 namespace content {
 class BrowserContext;
 class WebContents;
 }
 
 namespace extensions {
 
 class Extension;
 struct GrantedFileEntry;
 
 class AppRuntimeEventRouter {
  public:
   // Dispatches the onEmbedRequested event to the given app.
   static void DispatchOnEmbedRequestedEvent(
       content::BrowserContext* context,
       scoped_ptr<base::DictionaryValue> app_embedding_request_data,
       const extensions::Extension* extension);
 
   // Dispatches the onLaunched event to the given app.
   static void DispatchOnLaunchedEvent(content::BrowserContext* context,

[benwells, 2014/10/21 03:51:58]

Again, can we augment this function instead of creating a new one?

[cylee1, 2014/10/21 13:41:16]

Done.

                                       const Extension* extension);
 
+  // Dispatches the onLaunched event to the given app with source parameters.
+  static void DispatchOnLaunchedEventWithSource(
+      content::BrowserContext* context,
+      const Extension* extension,
+      extensions::AppLaunchSource source);
+
   // Dispatches the onRestarted event to the given app, providing a list of
   // restored file entries from the previous run.
   static void DispatchOnRestartedEvent(content::BrowserContext* context,
                                        const Extension* extension);
 
   // TODO(benwells): Update this comment, it is out of date.
   // Dispatches the onLaunched event to the given app, providing launch data of
   // the form:
   // {
   //   "intent" : {
@@ skipping 19 matching lines @@
   static void DispatchOnLaunchedEventWithUrl(content::BrowserContext* context,
                                              const Extension* extension,
                                              const std::string& handler_id,
                                              const GURL& url,
                                              const GURL& referrer_url);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_API_APP_RUNTIME_APP_RUNTIME_API_H_