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 2b6ac528c82a547114659117f69dbd429b973765..382a31a4486372b8c7e638b86f0eb0ae7f7f78c5 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 +318,10 @@ 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("drawWebVr", &webvr_rendering_enabled_);
         break;
     }
   }
@@ -357,14 +354,18 @@ ContentRectangle* UiScene::GetUiElementById(int element_id) {
   return nullptr;
 }
 
-const Colorf& UiScene::GetBackgroundColor() {
+const Colorf& UiScene::GetBackgroundColor() const {
   return background_color_;
 }
 
-float UiScene::GetBackgroundDistance() {
+float UiScene::GetBackgroundDistance() const {
   return background_distance_;
 }
 
+bool UiScene::GetWebVrRenderingEnabled() const {
+  return webvr_rendering_enabled_;

[mthiesse, 2017/03/20 17:32:16]

This defaulting to false is going to dramatically slow down the transition into
WebVR. As in, we won't show webVR until the UI was loaded, where this previously
wasn't the case.

This might be fine, but at the very least we shouldn't be requesting webVR
frames until we're showing them.

[mthiesse, 2017/03/20 17:38:33]

Disregard this I misread.

+}
+
 const std::vector<std::unique_ptr<ContentRectangle>>& UiScene::GetUiElements()
     const {
   return ui_elements_;