Implement a modal permission dialog on Android gated by a feature.

chrome/common/chrome_features.cc

 // Copyright 2016 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_features.h"
 
 namespace features {
 
 // All features in alphabetical order.
 
@@ skipping 96 matching lines @@
 
 // Enables or disables the Material Design version of chrome://history.
 const base::Feature kMaterialDesignHistory{
     "MaterialDesignHistory", base::FEATURE_ENABLED_BY_DEFAULT};
 
 // Enables or disables the Material Design version of chrome://settings.
 // Also affects chrome://help.
 const base::Feature kMaterialDesignSettings{
     "MaterialDesignSettings", base::FEATURE_DISABLED_BY_DEFAULT};
 
+// Enables or disables modal permission prompts.
+const base::Feature kModalPermissionPrompts{"ModalPermissionPrompts",
+                                            base::FEATURE_DISABLED_BY_DEFAULT};
+
 // Enables the use of native notification centers instead of using the Message
 // Center for displaying the toasts.
 #if defined(OS_MACOSX)
 const base::Feature kNativeNotifications{"NativeNotifications",
                                          base::FEATURE_DISABLED_BY_DEFAULT};
 #endif  // defined(OS_MACOSX)
 
 #if defined(ENABLE_PLUGINS)
 // Prefer HTML content by hiding Flash from the list of plugins.
 // https://crbug.com/626728
@@ skipping 49 matching lines @@
 // Enables or disables PIN quick unlock settings integration.
 const base::Feature kQuickUnlockPin{"QuickUnlockPin",
                                     base::FEATURE_DISABLED_BY_DEFAULT};
 
 // Enables or disables emoji, handwriting and voice input on opt-in IME menu.
 const base::Feature kEHVInputOnImeMenu{"EmojiHandwritingVoiceInput",
                                        base::FEATURE_DISABLED_BY_DEFAULT};
 #endif  // defined(OS_CHROMEOS)
 
 }  // namespace features