Provide WebContents::CreateParams to tab helpers.

chrome/browser/ui/tab_helpers.h

 // Copyright 2014 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.
 
 #ifndef CHROME_BROWSER_UI_TAB_HELPERS_H_
 #define CHROME_BROWSER_UI_TAB_HELPERS_H_
 
+#include "base/optional.h"
+#include "content/public/browser/web_contents.h"

[Peter Kasting, 2017/05/25 23:21:44]

Do you really need to #include web_contents.h?  I'd think the forward-decl of it
before would continue to work.

[Bryan McQuade, 2017/05/26 00:39:44]

WebContents::CreateParams is an inner class of WebContents. My understanding is
there's no way to forward declare a nested class like this. Let me know if I'm
mistaken - very happy to forward declare if it is possible to do so.

+
 namespace android {
 class TabWebContentsDelegateAndroid;
 }
 
-namespace content {
-class WebContents;
-}
-
 namespace chrome {
 class BrowserTabStripModelDelegate;
 }
 
 namespace prerender {
 class PrerenderContents;
 }
 
 // A "tab contents" is a WebContents that is used as a tab in a browser window
 // (or the equivalent on Android). The TabHelpers class allows specific classes
@@ skipping 27 matching lines @@
   friend class prerender::PrerenderContents;
 
   // FYI: Do NOT add any more friends here. The functions above are the ONLY
   // ones that need to call AttachTabHelpers; if you think you do, re-read the
   // design document linked above, especially the section "Reusing tab helpers".
 
   // Adopts the specified WebContents as a full-fledged browser tab, attaching
   // all the associated tab helpers that are needed for the WebContents to
   // serve in that role. It is safe to call this on a WebContents that was
   // already adopted.
-  static void AttachTabHelpers(content::WebContents* web_contents);
+  static void AttachTabHelpers(
+      content::WebContents* web_contents,
+      const base::Optional<content::WebContents::CreateParams>& create_params);
 };
 
 #endif  // CHROME_BROWSER_UI_TAB_HELPERS_H_