Add VrShell feature flag and wire it up to VrShell delegate.

chrome/common/chrome_switches.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/common/chrome_switches.h"
 
 #include "base/base_switches.h"
 #include "base/command_line.h"
 #include "build/build_config.h"
 
@@ skipping 1015 matching lines @@
 #if defined(OS_ANDROID)
 // Android authentication account type for SPNEGO authentication
 const char kAuthAndroidNegotiateAccountType[] = "auth-spnego-account-type";
 
 // Disable App Link.
 const char kDisableAppLink[] = "disable-app-link";
 
 // Disables Contextual Search.
 const char kDisableContextualSearch[] = "disable-contextual-search";
 
-// Disable VR UI if supported.
-const char kDisableVrShell[] = "disable-vr-shell";
-
 // Enable the accessibility tab switcher.
 const char kEnableAccessibilityTabSwitcher[] =
     "enable-accessibility-tab-switcher";
 
 // Enable App Link.
 const char kEnableAppLink[] = "enable-app-link";
 
 // Enables Contextual Search.
 const char kEnableContextualSearch[] = "enable-contextual-search";
 
 // Enables Contextual Search UI integration with Contextual Cards data.
 const char kEnableContextualSearchContextualCardsBarIntegration[] =
     "cs-contextual-cards-bar-integration";
 
 // Enables chrome hosted mode for Android.
 const char kEnableHostedMode[] = "enable-hosted-mode";
 
 // Enables a hung renderer InfoBar allowing the user to close or wait on
 // unresponsive web content.
 const char kEnableHungRendererInfoBar[] = "enable-hung-renderer-infobar";
 
-// Enable VR UI if supported.
-const char kEnableVrShell[] = "enable-vr-shell";
-
 // Enables "Add to Home screen" in the app menu to generate WebAPKs.
 const char kEnableWebApk[] = "enable-webapk";
 
 // Forces the update menu badge to show.
 const char kForceShowUpdateMenuBadge[] = "force-show-update-menu-badge";
 
 // Forces the update menu item to show.
 const char kForceShowUpdateMenuItem[] = "force-show-update-menu-item";
 
 // Forces a custom summary to be displayed below the update menu item.
@@ skipping 256 matching lines @@
 
 // -----------------------------------------------------------------------------
 // DO NOT ADD YOUR VERY NICE FLAGS TO THE BOTTOM OF THIS FILE.
 //
 // You were going to just dump your switches here, weren't you? Instead, please
 // put them in alphabetical order above, or in order inside the appropriate
 // ifdef at the bottom. The order should match the header.
 // -----------------------------------------------------------------------------
 
 }  // namespace switches