Add PermissionPromptAndroid skeleton

chrome/browser/permissions/permission_request_manager.h

Index: chrome/browser/permissions/permission_request_manager.h
diff --git a/chrome/browser/permissions/permission_request_manager.h b/chrome/browser/permissions/permission_request_manager.h
index def150e1a9606b7fe9b8f6fa147475115d17db07..b618b0cf8d8b6fd41191a4114db7f702625988f1 100644
--- a/chrome/browser/permissions/permission_request_manager.h
+++ b/chrome/browser/permissions/permission_request_manager.h
@@ -84,6 +84,10 @@ class PermissionRequestManager
   // TODO(hcarmona): Remove this as part of the bubble API work.
   bool IsBubbleVisible();
 
+  // Whether PermissionRequestManager is reused on Android, instead of
+  // PermissionQueueController.
+  static bool IsEnabled();
+
   // Get the native window of the bubble.
   // TODO(hcarmona): Remove this as part of the bubble API work.
   gfx::NativeWindow GetBubbleWindow();