Introduce an extension parameter which is used to customize the extension. It's available for exter…

chrome/browser/extensions/pending_extension_manager.h

Index: chrome/browser/extensions/pending_extension_manager.h
diff --git a/chrome/browser/extensions/pending_extension_manager.h b/chrome/browser/extensions/pending_extension_manager.h
index 4c3572c5ce6cfdc46a9cf9fc155db17595018d75..2ca110d4870f54f9ea3fab9739a04a6c1757640b 100644
--- a/chrome/browser/extensions/pending_extension_manager.h
+++ b/chrome/browser/extensions/pending_extension_manager.h
@@ -90,6 +90,7 @@ class PendingExtensionManager {
   // Given an extension id and an update URL, schedule the extension
   // to be fetched, installed, and activated.
   bool AddFromExternalUpdateUrl(const std::string& id,
+                                const std::string& install_parameter,
                                 const GURL& update_url,
                                 Manifest::Location location,
                                 int creation_flags,
@@ -118,6 +119,7 @@ class PendingExtensionManager {
   // Return true if the extension was added.
   bool AddExtensionImpl(
       const std::string& id,
+      const std::string& install_parameter,
       const GURL& update_url,
       const base::Version& version,
       PendingExtensionInfo::ShouldAllowInstallPredicate should_allow_install,