ntp4: make app-install-via-drag less janky

chrome/browser/extensions/crx_installer.h

Index: chrome/browser/extensions/crx_installer.h
diff --git a/chrome/browser/extensions/crx_installer.h b/chrome/browser/extensions/crx_installer.h
index 1db81048c31b0987d3ef49292d257b2a8fb058ad..52d6248cc38e8b69d548b1c89ec3aaa45eaf4d4a 100644
--- a/chrome/browser/extensions/crx_installer.h
+++ b/chrome/browser/extensions/crx_installer.h
@@ -153,6 +153,10 @@ class CrxInstaller
     install_cause_ = install_cause;
   }
 
+  void set_page_index(int page_index) {
+    page_index_ = page_index;
+  }
+
  private:
   friend class ExtensionUpdaterTest;
 
@@ -239,6 +243,9 @@ class CrxInstaller
   // ExtensionService on success, or delete it on failure.
   scoped_refptr<const Extension> extension_;
 
+  // The index of the NTP apps page |extension_| will be shown on.
+  int page_index_;
+
   // A parsed copy of the unmodified original manifest, before any
   // transformations like localization have taken place.
   scoped_ptr<base::DictionaryValue> original_manifest_;