Implement a means of letting native VR Shell control the HTML UI.

chrome/browser/ui/webui/vr_shell/vr_shell_ui_message_handler.cc

Index: chrome/browser/ui/webui/vr_shell/vr_shell_ui_message_handler.cc
diff --git a/chrome/browser/ui/webui/vr_shell/vr_shell_ui_message_handler.cc b/chrome/browser/ui/webui/vr_shell/vr_shell_ui_message_handler.cc
index c970d84b09a05184467e30984398c8985f42c988..c9c6e510dcb924268e08e433b1f8fb1c7a321997 100644
--- a/chrome/browser/ui/webui/vr_shell/vr_shell_ui_message_handler.cc
+++ b/chrome/browser/ui/webui/vr_shell/vr_shell_ui_message_handler.cc
@@ -10,11 +10,13 @@
 #include "base/bind_helpers.h"
 #include "base/callback.h"
 #include "base/values.h"
+#include "chrome/browser/android/vr_shell/ui_interface.h"
 #include "chrome/browser/android/vr_shell/ui_scene.h"
 #include "chrome/browser/android/vr_shell/vr_shell.h"
 #include "content/public/browser/web_ui.h"
 
-VrShellUIMessageHandler::VrShellUIMessageHandler() = default;
+VrShellUIMessageHandler::VrShellUIMessageHandler() :

[bshe, 2016/10/19 21:02:40]

nit: : move colon to next line 

[cjgrant, 2016/10/20 15:25:39]

Done.

+      weak_ptr_factory_(this) {}
 
 VrShellUIMessageHandler::~VrShellUIMessageHandler() = default;
 
@@ -36,6 +38,8 @@ void VrShellUIMessageHandler::HandleDomLoaded(const base::ListValue* args) {
   if (!vr_shell_)
     return;
 
+  vr_shell_->GetUiInterface()->SetUiMessageHandler(
+      weak_ptr_factory_.GetWeakPtr());
   vr_shell_->OnDomContentsLoaded();
 }