Add a chrome://webapks page.

chrome/browser/ui/webui/chrome_web_ui_controller_factory.cc

Index: chrome/browser/ui/webui/chrome_web_ui_controller_factory.cc
diff --git a/chrome/browser/ui/webui/chrome_web_ui_controller_factory.cc b/chrome/browser/ui/webui/chrome_web_ui_controller_factory.cc
index 559b7d8b1fd3037870817a5d909fdafed52926f6..d44967de9fe5786ce53b9dbfb509759a9013e732 100644
--- a/chrome/browser/ui/webui/chrome_web_ui_controller_factory.cc
+++ b/chrome/browser/ui/webui/chrome_web_ui_controller_factory.cc
@@ -115,6 +115,7 @@
 #include "chrome/browser/ui/webui/offline/offline_internals_ui.h"
 #include "chrome/browser/ui/webui/popular_sites_internals_ui.h"
 #include "chrome/browser/ui/webui/snippets_internals_ui.h"
+#include "chrome/browser/ui/webui/webapks_ui.h"
 #if defined(ENABLE_VR_SHELL) || defined(ENABLE_WEBVR)
 #include "chrome/browser/ui/webui/vr_shell/vr_shell_ui_ui.h"
 #endif
@@ -521,6 +522,8 @@ WebUIFactoryFunction GetWebUIFactoryFunction(WebUI* web_ui,
   if (url.host_piece() == chrome::kChromeUISnippetsInternalsHost &&
       !profile->IsOffTheRecord())
     return &NewWebUI<SnippetsInternalsUI>;
+  if (url.host_piece() == chrome::kChromeUIWebAPKsHost)
+    return &NewWebUI<WebAPKsUI>;
 #if defined(ENABLE_VR_SHELL) || defined(ENABLE_WEBVR)
   if (url.host_piece() == chrome::kChromeUIVrShellUIHost)
     return &NewWebUI<VrShellUIUI>;