Add menu mode plumbing for WebVR mode.

chrome/browser/android/vr_shell/ui_scene.cc

Index: chrome/browser/android/vr_shell/ui_scene.cc
diff --git a/chrome/browser/android/vr_shell/ui_scene.cc b/chrome/browser/android/vr_shell/ui_scene.cc
index f07076f8066683b9a7a4c5674883f99c8dbbea96..ed0eeaddfc2df024b5d0fabe681dc7e1862ba499 100644
--- a/chrome/browser/android/vr_shell/ui_scene.cc
+++ b/chrome/browser/android/vr_shell/ui_scene.cc
@@ -284,11 +284,6 @@ void UiScene::RemoveAnimation(int element_id, int animation_id) {
   }
 }
 
-void UiScene::UpdateBackgroundFromDict(const base::DictionaryValue& dict) {
-  ParseColorf(dict, "color", &background_color_);
-  ParseFloat(dict, "distance", &background_distance_);
-}
-
 void UiScene::HandleCommands(std::unique_ptr<base::ListValue> commands,
                              int64_t time_in_micro) {
   for (auto& item : *commands) {
@@ -323,8 +318,11 @@ void UiScene::HandleCommands(std::unique_ptr<base::ListValue> commands,
         RemoveAnimation(element_id, animation_id);
         break;
       }
-      case Command::UPDATE_BACKGROUND:
-        UpdateBackgroundFromDict(*data);
+      case Command::CONFIGURE_SCENE:
+        ParseColorf(*data, "backgroundColor", &background_color_);
+        ParseFloat(*data, "backgroundDistance", &background_distance_);
+        data->GetBoolean("drawCursor", &cursor_enabled_);
+        data->GetBoolean("drawWebVr", &webvr_rendering_enabled_);

[cjgrant, 2017/03/16 15:44:36]

We could merge this with the action "pause content", or keep them separate.  I'd
prefer to merge them, unless there's disagreement.

[tiborg, 2017/03/16 19:40:22]

+1 for merging.

[cjgrant, 2017/03/20 15:34:57]

In the end, I merged the two rendering properties, but not the pausing.  Pausing
is done by a separate native system, and linking them is messy.

[tiborg, 2017/03/20 15:56:08]

SGTM.

         break;
     }
   }
@@ -355,14 +353,22 @@ ContentRectangle* UiScene::GetUiElementById(int element_id) {
   return nullptr;
 }
 
-const Colorf& UiScene::GetBackgroundColor() {
+const Colorf& UiScene::GetBackgroundColor() const {

[tiborg, 2017/03/16 19:40:22]

+1 for const!

   return background_color_;
 }
 
-float UiScene::GetBackgroundDistance() {
+float UiScene::GetBackgroundDistance() const {
   return background_distance_;
 }
 
+bool UiScene::GetCursorEnabled() const {
+  return cursor_enabled_;
+}
+
+bool UiScene::GetWebVrRenderingEnabled() const {
+  return webvr_rendering_enabled_;
+}
+
 const std::vector<std::unique_ptr<ContentRectangle>>& UiScene::GetUiElements()
     const {
   return ui_elements_;