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

chrome/browser/ui/extensions/application_launch.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_APPLICATION_LAUNCH_H_
 #define CHROME_BROWSER_UI_EXTENSIONS_APPLICATION_LAUNCH_H_
 
 #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 Browser;
 class Profile;
 
 namespace base {
 class CommandLine;
 }
@@ skipping 51 matching lines @@
   // position and dimensions.
   gfx::Rect override_bounds;
 
   // If non-empty, information from the command line may be passed on to the
   // application.
   base::CommandLine command_line;
 
   // 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;
 };
 
 // Opens the application, possibly prompting the user to re-enable it.
 void OpenApplicationWithReenablePrompt(const AppLaunchParams& params);
 
 // Open the application in a way specified by |params|.
 content::WebContents* OpenApplication(const AppLaunchParams& params);
 
 // Open |url| in an app shortcut window.
 // There are two kinds of app shortcuts: Shortcuts to a URL,
 // and shortcuts that open an installed application.  This function
 // is used to open the former.  To open the latter, use
 // application_launch::OpenApplication().
 content::WebContents* OpenAppShortcutWindow(Profile* profile,
                                             const GURL& url);
 
 // Whether the extension can be launched by sending a
 // chrome.app.runtime.onLaunched event.
 bool CanLaunchViaEvent(const extensions::Extension* extension);
 
 // Get the launch URL for a given extension, with optional override/fallback.
 // |override_url|, if non-empty, will be preferred over the extension's
 // launch url.
 GURL UrlForExtension(const extensions::Extension* extension,
                      const GURL& override_url);
 
 #endif  // CHROME_BROWSER_UI_EXTENSIONS_APPLICATION_LAUNCH_H_