Control visibility of 2D VR menu buttons using native state.

chrome/browser/android/vr_shell/vr_shell.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/vr_shell.h"
 
 #include "base/metrics/histogram_macros.h"
 #include "chrome/browser/android/vr_shell/ui_elements.h"
 #include "chrome/browser/android/vr_shell/ui_interface.h"
 #include "chrome/browser/android/vr_shell/ui_scene.h"
@@ skipping 744 matching lines @@
 }
 
 void VrShell::SetWebVrMode(JNIEnv* env,
                            const base::android::JavaParamRef<jobject>& obj,
                            bool enabled) {
   webvr_mode_ = enabled;
   if (enabled) {
     int64_t now = gvr::GvrApi::GetTimePointNow().monotonic_system_time_nanos;
     constexpr int64_t seconds_to_nanos = 1000 * 1000 * 1000;
     webvr_warning_end_nanos_ = now + kWebVrWarningSeconds * seconds_to_nanos;
+    html_interface_->SetMode(UiInterface::Mode::WEB_VR);
   } else {
     webvr_warning_end_nanos_ = 0;
+    html_interface_->SetMode(UiInterface::Mode::STANDARD);
   }
 }
 
 void VrShell::SetWebVRSecureOrigin(bool secure_origin) {
   webvr_secure_origin_ = secure_origin;
 }
 
 void VrShell::SubmitWebVRFrame() {
 }
 
@@ skipping 97 matching lines @@
            const JavaParamRef<jobject>& ui_web_contents,
            jlong ui_window_android) {
   return reinterpret_cast<intptr_t>(new VrShell(
       env, obj, content::WebContents::FromJavaWebContents(content_web_contents),
       reinterpret_cast<ui::WindowAndroid*>(content_window_android),
       content::WebContents::FromJavaWebContents(ui_web_contents),
       reinterpret_cast<ui::WindowAndroid*>(ui_window_android)));
 }
 
 }  // namespace vr_shell