Add separate feature flag for VR CCT browsing.

chrome/browser/android/chrome_feature_list.cc

Index: chrome/browser/android/chrome_feature_list.cc
diff --git a/chrome/browser/android/chrome_feature_list.cc b/chrome/browser/android/chrome_feature_list.cc
index f9c5b8f4a916265161558195c4dee51e2ff3e7c0..3a87473e730f0a81f52cfee03e711f56be007786 100644
--- a/chrome/browser/android/chrome_feature_list.cc
+++ b/chrome/browser/android/chrome_feature_list.cc
@@ -81,6 +81,7 @@ const base::Feature* kFeaturesExposedToJava[] = {
     &kSpecialLocaleWrapper,
     &kTabReparenting,
     &kVideoPersistence,
+    &kVrCustomTabBrowsing,
     &kWebPaymentsModifiers,
     &kWebPaymentsSingleAppUiSkip,
     &kWebVRCardboardSupport,
@@ -225,6 +226,9 @@ const base::Feature kUserMediaScreenCapturing{
 const base::Feature kVideoPersistence{"VideoPersistence",
                                       base::FEATURE_ENABLED_BY_DEFAULT};
 
+const base::Feature kVrCustomTabBrowsing{"VrCustomTabBrowsing",
+                                         base::FEATURE_DISABLED_BY_DEFAULT};
+
 const base::Feature kWebPaymentsModifiers{"WebPaymentsModifiers",
                                           base::FEATURE_DISABLED_BY_DEFAULT};