Clean up threading around VR Scene updates.

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

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/webui/vr_shell/vr_shell_ui_message_handler.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 40 matching lines @@
   // deleted.
   if (!vr_shell_)
     return;
   vr_shell_->GetUiInterface()->SetUiCommandHandler(this);
   vr_shell_->OnDomContentsLoaded();
 }
 
 void VrShellUIMessageHandler::HandleUpdateScene(const base::ListValue* args) {
   if (!vr_shell_)
     return;
-
-  // Copy the update instructions and handle them on the render thread.
-  // TODO(mthiesse): Clean this up.
-  auto cb = base::Bind(&vr_shell::UiScene::HandleCommands,
-                       // Unretained is safe because this callback will only be
-                       // run on the GL thread, which owns the scene.
-                       base::Unretained(vr_shell_->GetScene()),
-                       base::Owned(args->CreateDeepCopy().release()),
-                       vr_shell::UiScene::TimeInMicroseconds());
-  vr_shell_->QueueTask(cb);
+  vr_shell_->UpdateScene(args);
 }
 
 void VrShellUIMessageHandler::HandleDoAction(const base::ListValue* args) {
   int action;
   CHECK(args->GetInteger(0, &action));
   if (vr_shell_) {
     vr_shell_->DoUiAction((vr_shell::UiAction) action);
   }
 }
 
 void VrShellUIMessageHandler::HandleSetUiCssSize(const base::ListValue* args) {
   CHECK(args->GetSize() == 3);
   double width, height, dpr;
   CHECK(args->GetDouble(0, &width));
   CHECK(args->GetDouble(1, &height));
   CHECK(args->GetDouble(2, &dpr));
   if (vr_shell_) {
     vr_shell_->SetUiCssSize(width, height, dpr);
   }
 }
 
 void VrShellUIMessageHandler::SendCommandToUi(const base::Value& value) {
   CallJavascriptFunction("vrShellUi.command", value);
 }