Quick fix to get 7DA counts for unified Chrome / App Launcher.

chrome/installer/setup/install_worker.cc

 // 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.
 //
 // This file contains the definitions of the installer functions that build
 // the WorkItemList used to install the application.
 
 #include "chrome/installer/setup/install_worker.h"
 
 #include <oaidl.h>
@@ skipping 1205 matching lines @@
     AddVersionKeyWorkItems(root, product.distribution(), new_version,
                            add_language_identifier, install_list);
 
     AddDelegateExecuteWorkItems(installer_state, target_path, new_version,
                                 product, install_list);
 
     AddActiveSetupWorkItems(installer_state, setup_path, new_version, product,
                             install_list);
   }
 
+  // TODO(huangs): Implement actual migration code and remove the hack below.
+  // If installing Chrome without the deprecated stand-alone App Launcher,
+  // add "shadow" App Launcher registry keys so Google Update would recognize
+  // the "dr" value in the App Launcher ClientState key.
+  if (installer_state.is_multi_install() &&

[grt (UTC plus 2), 2013/05/07 20:52:02]

Please add to the comment that this magically omits the new version key work
items for Chrome canary by way of the is_multi_install(). I imagine that's what
you want (correct me if I'm wrong).

[huangs, 2013/05/08 01:22:02]

Done.  I assume that Chrome Canary does not have 7DA tracking; so the same
should hold for App Launcher.

+      installer_state.FindProduct(BrowserDistribution::CHROME_BROWSER) &&
+      !installer_state.FindProduct(BrowserDistribution::CHROME_APP_HOST)) {
+    BrowserDistribution* shadow_app_launcher_dist =
+        BrowserDistribution::GetSpecificDistribution(
+            BrowserDistribution::CHROME_APP_HOST);
+    AddVersionKeyWorkItems(root, shadow_app_launcher_dist, new_version,
+                           add_language_identifier, install_list);
+  }
+
   // Add any remaining work items that involve special settings for
   // each product.
   AddProductSpecificWorkItems(original_state, installer_state, setup_path,
                               new_version, install_list);
 
   // Copy over brand, usagestats, and other values.
   AddGoogleUpdateWorkItems(original_state, installer_state, install_list);
 
   // Append the tasks that run after the installation.
   AppendPostInstallTasks(installer_state,
@@ skipping 461 matching lines @@
     if (installer_state.system_install())
       cmd_line.AppendSwitch(switches::kSystemLevel);
     AppCommand cmd(cmd_line.GetCommandLineString());
     cmd.set_sends_pings(true);
     cmd.set_is_web_accessible(true);
     cmd.AddWorkItems(installer_state.root_key(), cmd_key, work_item_list);
   }
 }
 
 }  // namespace installer