Add separate feature flag for VR CCT browsing.

chrome/browser/about_flags.cc

 // Copyright (c) 2012 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/about_flags.h"
 
 #include <iterator>
 #include <map>
 #include <set>
 #include <utility>
@@ skipping 1993 matching lines @@
      SINGLE_VALUE_TYPE(switches::kEnableWebVR)},
 #if BUILDFLAG(ENABLE_VR)
     {"enable-webvr-experimental-rendering",
      flag_descriptions::kWebvrExperimentalRenderingName,
      flag_descriptions::kWebvrExperimentalRenderingDescription, kOsAndroid,
      FEATURE_VALUE_TYPE(features::kWebVRExperimentalRendering)},
 #if defined(OS_ANDROID)
     {"enable-vr-shell", flag_descriptions::kEnableVrShellName,
      flag_descriptions::kEnableVrShellDescription, kOsAndroid,
      FEATURE_VALUE_TYPE(features::kVrShell)},
+    {"enable-vr-custom-tab-browsing",
+     flag_descriptions::kVrCustomTabBrowsingName,
+     flag_descriptions::kVrCustomTabBrowsingDescription, kOsAndroid,
+     FEATURE_VALUE_TYPE(chrome::android::kVrCustomTabBrowsing)},

[amp, 2017/05/17 23:22:04]

The namespace threw me off for a bit here, but I guess it's only ever going to
be applicable for Android.

It does make me wonder if we should move the vr shell flag out of the ANDROID if
def, but I guess it wouldn't do anything yet anyway (but then again the
experimental rendering flag doesn't do anything on non-Android either).

 #endif  // OS_ANDROID
 #endif  // ENABLE_VR
 #if defined(OS_CHROMEOS)
     {"disable-accelerated-mjpeg-decode",
      flag_descriptions::kAcceleratedMjpegDecodeName,
      flag_descriptions::kAcceleratedMjpegDecodeDescription, kOsCrOS,
      SINGLE_DISABLE_VALUE_TYPE(switches::kDisableAcceleratedMjpegDecode)},
 #endif  // OS_CHROMEOS
     {"v8-cache-options", flag_descriptions::kV8CacheOptionsName,
      flag_descriptions::kV8CacheOptionsDescription, kOsAll,
@@ skipping 1140 matching lines @@
 const base::HistogramBase::Sample kBadSwitchFormatHistogramId = 0;
 
 const FeatureEntry* GetFeatureEntries(size_t* count) {
   *count = arraysize(kFeatureEntries);
   return kFeatureEntries;
 }
 
 }  // namespace testing
 
 }  // namespace about_flags