Add separate feature flag for VR CCT browsing.

chrome/browser/flag_descriptions.cc

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/flag_descriptions.h"
 
 namespace flag_descriptions {
 
 //  Material Design version of chrome://bookmarks
 
@@ skipping 569 matching lines @@
     "used instead of this encoder/decoder.";
 
 #endif  // BUILDFLAG(ENABLE_WEBRTC)
 
 const char kWebvrName[] = "WebVR";
 
 const char kWebvrDescription[] =
     "Enabling this option allows web applications to access experimental "
     "Virtual Reality APIs.";
 
+#if BUILDFLAG(ENABLE_VR)
+
 const char kWebvrExperimentalRenderingName[] =
     "WebVR experimental rendering optimizations";
 
 const char kWebvrExperimentalRenderingDescription[] =
     "Enabling this option activates experimental rendering path "
     "optimizations for WebVR.";
 
+#endif  // BUILDFLAG(ENABLE_VR)
+
 const char kGamepadExtensionsName[] = "Gamepad Extensions";
 
 const char kGamepadExtensionsDescription[] =
     "Enabling this option allows web applications to access experimental "
     "extensions to the Gamepad APIs.";
 
 #if defined(OS_ANDROID)
 
 const char kNewPhotoPickerName[] = "Enable new Photopicker";
 
@@ skipping 1912 matching lines @@
     "gesture.";
 
 const char kVibrateRequiresUserGestureName[] =
     "Requiring user gesture for the Vibration API";
 
 const char kVibrateRequiresUserGestureDescription[] =
     "Block the Vibration API if no user gesture has been received on "
     "the frame or any embedded frame.";
 
 #if defined(OS_ANDROID)
-
+#if BUILDFLAG(ENABLE_VR)
 const char kEnableVrShellName[] = "Enable Chrome VR.";
 
 const char kEnableVrShellDescription[] =
     "Allow browsing with a VR headset if available for this device.";
 
+const char kVrCustomTabBrowsingName[] = "Enable Custom Tab browsing in VR.";
+
+const char kVrCustomTabBrowsingDescription[] =
+    "Allow browsing with a VR headset in a Custom Tab if available for this "
+    "device.";
+#endif  // BUILDFLAG(ENABLE_VR)
 #endif  // defined(OS_ANDROID)
 
 //  Web payments
 
 const char kWebPaymentsName[] = "Web Payments";
 
 const char kWebPaymentsDescription[] =
     "Enable Web Payments API integration, a JavaScript API for merchants.";
 
 #if defined(OS_ANDROID)
@@ skipping 606 matching lines @@
 
 #endif  // !defined(OS_ANDROID) && !defined(OS_IOS)
 
 #if defined(OS_MACOSX)
 extern const char kMacRTLName[] = "Enable RTL";
 extern const char kMacRTLDescription[] =
     "Mirrors the UI for RTL language users";
 #endif
 
 }  // namespace flag_descriptions