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

chrome/installer/setup/install_worker.cc

Index: chrome/installer/setup/install_worker.cc
diff --git a/chrome/installer/setup/install_worker.cc b/chrome/installer/setup/install_worker.cc
index 5450e32947b91e6495cd6d54f93d1a996e69c3ea..40b71b7ce81a28aebb62e4ddfae32eba52c7aa55 100644
--- a/chrome/installer/setup/install_worker.cc
+++ b/chrome/installer/setup/install_worker.cc
@@ -1223,6 +1223,20 @@ void AddInstallWorkItems(const InstallationState& original_state,
                             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,