Add menu mode plumbing for WebVR mode.

chrome/browser/resources/vr_shell/vr_shell_ui.js

Index: chrome/browser/resources/vr_shell/vr_shell_ui.js
diff --git a/chrome/browser/resources/vr_shell/vr_shell_ui.js b/chrome/browser/resources/vr_shell/vr_shell_ui.js
index 316a82e125897bbee60016a9b2cecbe0a2e43457..f01ace16594be68751d1a2aecf25d1a61ffa4a0e 100644
--- a/chrome/browser/resources/vr_shell/vr_shell_ui.js
+++ b/chrome/browser/resources/vr_shell/vr_shell_ui.js
@@ -101,14 +101,14 @@ var vrShellUi = (function() {
       if (this.menuMode == enabled)
         return;
       this.menuMode = enabled;
-      this.updateState()
+      this.updateState();
     }
 
     setFullscreen(enabled) {
       if (this.fullscreen == enabled)
         return;
       this.fullscreen = enabled;
-      this.updateState()
+      this.updateState();
     }
 
     updateState() {
@@ -1145,8 +1145,9 @@ var vrShellUi = (function() {
       let fullscreen = this.fullscreen;
 
       api.doAction(api.Action.SET_CONTENT_PAUSED, {'paused': menuMode});
+      ui.setWebVrRenderingModeEnabled(mode == api.Mode.WEB_VR && !menuMode);
 
-      this.contentQuad.setEnabled(mode == api.Mode.STANDARD);
+      this.contentQuad.setEnabled(mode == api.Mode.STANDARD || menuMode);
       this.contentQuad.setFullscreen(fullscreen);
       this.contentQuad.setMenuMode(menuMode);
       // TODO(crbug/643815): Set aspect ratio on content quad when available.
@@ -1162,11 +1163,12 @@ var vrShellUi = (function() {
       this.secureOriginWarnings.setEnabled(
           mode == api.Mode.WEB_VR && !menuMode);
       this.background.setState(mode, menuMode, fullscreen);
-      this.tabContainer.setEnabled(mode == api.Mode.STANDARD && menuMode);
+      this.tabContainer.setEnabled(menuMode);
 
       this.reloadUiButton.setEnabled(mode == api.Mode.STANDARD);
       this.keyboard.setEnabled(mode == api.Mode.STANDARD && menuMode);
 
+
       api.setUiCssSize(
           uiRootElement.clientWidth, uiRootElement.clientHeight, UI_DPR);
     }