Tie VR omnibox to page load progress through TabObserver.

chrome/browser/android/vr_shell/ui_interface.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/android/vr_shell/ui_interface.h"
 
 #include "chrome/browser/ui/webui/vr_shell/vr_shell_ui_message_handler.h"
 #include "url/gurl.h"
 
 namespace vr_shell {
@@ skipping 35 matching lines @@
 void UiInterface::SetWebVRSecureOrigin(bool secure) {
   updates_.SetBoolean("webVRSecureOrigin", secure);
   FlushUpdates();
 }
 
 void UiInterface::SetLoading(bool loading) {
   updates_.SetBoolean("loading", loading);
   FlushUpdates();
 }
 
+void UiInterface::SetLoadProgress(double progress) {
+  updates_.SetDouble("loadProgress", progress);
+  FlushUpdates();
+}
+
 void UiInterface::SetURL(const GURL& url) {
   std::unique_ptr<base::DictionaryValue> details(new base::DictionaryValue);
   details->SetString("host", url.host());
   details->SetString("path", url.path());
 
   updates_.Set("url", std::move(details));
   FlushUpdates();
 }
 
 void UiInterface::OnDomContentsLoaded() {
   loaded_ = true;
 #if defined(ENABLE_VR_SHELL_UI_DEV)
   updates_.SetBoolean("enableReloadUi", true);
 #endif
   FlushUpdates();
 }
 
 void UiInterface::SetUiCommandHandler(UiCommandHandler* handler) {
   handler_ = handler;
 }
 
 void UiInterface::FlushUpdates() {
   if (loaded_ && handler_) {
     handler_->SendCommandToUi(updates_);
     updates_.Clear();
   }
 }
 
 }  // namespace vr_shell