Provide WebContents::CreateParams to tab helpers.

android_webview/browser/aw_web_contents_delegate.h

Index: android_webview/browser/aw_web_contents_delegate.h
diff --git a/android_webview/browser/aw_web_contents_delegate.h b/android_webview/browser/aw_web_contents_delegate.h
index f816ddca828dcde1eddc50addad15b98ce949c9c..e4aafd2a5468994c6d23dd5c4d28008886786d2c 100644
--- a/android_webview/browser/aw_web_contents_delegate.h
+++ b/android_webview/browser/aw_web_contents_delegate.h
@@ -41,12 +41,15 @@ class AwWebContentsDelegate
 
   void NavigationStateChanged(content::WebContents* source,
                               content::InvalidateTypes changed_flags) override;
-  void WebContentsCreated(content::WebContents* source_contents,
-                          int opener_render_process_id,
-                          int opener_render_frame_id,
-                          const std::string& frame_name,
-                          const GURL& target_url,
-                          content::WebContents* new_contents) override;
+  void WebContentsCreated(
+      content::WebContents* source_contents,
+      int opener_render_process_id,
+      int opener_render_frame_id,
+      const std::string& frame_name,
+      const GURL& target_url,
+      content::WebContents* new_contents,
+      const base::Optional<content::WebContents::CreateParams>& create_params)
+      override;
 
   void CloseContents(content::WebContents* source) override;
   void ActivateContents(content::WebContents* contents) override;