Add a function triggering extension installed to ExtensionRegistryObserver

chrome/browser/extensions/webstore_installer.h

Index: chrome/browser/extensions/webstore_installer.h
diff --git a/chrome/browser/extensions/webstore_installer.h b/chrome/browser/extensions/webstore_installer.h
index c0e2d50fc7461b046328faffdc978794d2779ceb..c2d1646888f37c69fdb7db086904c3d96582b911 100644
--- a/chrome/browser/extensions/webstore_installer.h
+++ b/chrome/browser/extensions/webstore_installer.h
@@ -11,6 +11,7 @@
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/scoped_observer.h"
 #include "base/supports_user_data.h"
 #include "base/timer/timer.h"
 #include "base/values.h"
@@ -22,6 +23,7 @@
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/web_contents_observer.h"
+#include "extensions/browser/extension_registry_observer.h"
 #include "extensions/common/manifest_handlers/shared_module_info.h"
 #include "ui/gfx/image/image_skia.h"
 #include "url/gurl.h"
@@ -40,14 +42,17 @@ namespace extensions {
 
 class CrxInstaller;
 class Extension;
+class ExtensionRegistry;
 class Manifest;
 
 // Downloads and installs extensions from the web store.
 class WebstoreInstaller : public content::NotificationObserver,
+                          public ExtensionRegistryObserver,
                           public content::DownloadItem::Observer,
                           public content::WebContentsObserver,
                           public base::RefCountedThreadSafe<
-  WebstoreInstaller, content::BrowserThread::DeleteOnUIThread> {
+                              WebstoreInstaller,
+                              content::BrowserThread::DeleteOnUIThread> {
  public:
   enum InstallSource {
     // Inline installs trigger slightly different behavior (install source
@@ -188,11 +193,18 @@ class WebstoreInstaller : public content::NotificationObserver,
   // Starts downloading and installing the extension.
   void Start();
 
-  // content::NotificationObserver
+  // content::NotificationObserver.
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
+  // ExtensionRegistryObserver.
+  virtual void OnExtensionWillBeInstalled(
+      content::BrowserContext* browser_context,
+      const Extension* extension,
+      bool is_update,
+      const std::string& old_name) OVERRIDE;
+
   // Removes the reference to the delegate passed in the constructor. Used when
   // the delegate object must be deleted before this object.
   void InvalidateDelegate();
@@ -249,6 +261,8 @@ class WebstoreInstaller : public content::NotificationObserver,
   void RecordInterrupt(const content::DownloadItem* download) const;
 
   content::NotificationRegistrar registrar_;
+  ScopedObserver<ExtensionRegistry, ExtensionRegistryObserver>
+      extension_registry_observer_;
   Profile* profile_;
   Delegate* delegate_;
   std::string id_;