Change how the VR reticle distance is determined.

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 8824338a7afc01f86955fe5e69e7c1dc7ee2b56a..a85fd877b54dc567a315c4226b8db79f0b301766 100644
--- a/chrome/browser/android/vr_shell/ui_scene.cc
+++ b/chrome/browser/android/vr_shell/ui_scene.cc
@@ -16,6 +16,17 @@ namespace vr_shell {
 
 namespace {
 
+bool ParseFloat(const base::DictionaryValue& dict,
+                const std::string& key,
+                float* output) {
+  double value;
+  if (!dict.GetDouble(key, &value)) {
+    return false;
+  }
+  *output = value;
+  return true;
+}
+
 bool ParseRecti(const base::DictionaryValue& dict,
                 const std::string& key,
                 Recti* output) {
@@ -323,6 +334,7 @@ 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,
@@ -390,14 +402,14 @@ ContentRectangle* UiScene::GetUiElementById(int element_id) {
   return nullptr;
 }
 
-ContentRectangle* UiScene::GetContentQuad() {
-  return content_element_;
-}
-
 const Colorf& UiScene::GetBackgroundColor() {
   return background_color_;
 }
 
+float UiScene::GetBackgroundDistance() {
+  return background_distance_;
+}
+
 const std::vector<std::unique_ptr<ContentRectangle>>&
 UiScene::GetUiElements() const {
   return ui_elements_;