Add a first-class off-store install UI to chrome://extensions/.

chrome/browser/ui/webui/extensions/extensions_ui.cc

Index: chrome/browser/ui/webui/extensions/extensions_ui.cc
diff --git a/chrome/browser/ui/webui/extensions/extensions_ui.cc b/chrome/browser/ui/webui/extensions/extensions_ui.cc
index 71c05b913c75ff0e5312772d515931c2e8bba72d..451e5baed2e242ee13656d8d326aa74d0ca7c41c 100644
--- a/chrome/browser/ui/webui/extensions/extensions_ui.cc
+++ b/chrome/browser/ui/webui/extensions/extensions_ui.cc
@@ -7,16 +7,14 @@
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/webui/chrome_url_data_manager.h"
 #include "chrome/browser/ui/webui/chrome_web_ui_data_source.h"
+#include "chrome/browser/ui/webui/extensions/install_extension_handler.h"
 #include "chrome/browser/ui/webui/extensions/pack_extension_handler.h"
 #include "chrome/browser/ui/webui/extensions/extension_settings_handler.h"
 #include "chrome/browser/ui/webui/shared_resources_data_source.h"
 #include "chrome/common/url_constants.h"
-#include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_ui.h"
 #include "grit/browser_resources.h"
 
-using content::WebContents;
-
 namespace {
 
 ChromeWebUIDataSource* CreateExtensionsHTMLSource() {
@@ -46,6 +44,11 @@ ExtensionsUI::ExtensionsUI(content::WebUI* web_ui) : WebUIController(web_ui) {
   PackExtensionHandler* pack_handler = new PackExtensionHandler();
   pack_handler->GetLocalizedValues(source->localized_strings());
   web_ui->AddMessageHandler(pack_handler);
+
+  InstallExtensionHandler* install_extension_handler =
+      new InstallExtensionHandler();
+  install_extension_handler->GetLocalizedValues(source->localized_strings());
+  web_ui->AddMessageHandler(install_extension_handler);
 }
 
 ExtensionsUI::~ExtensionsUI() {