Provide WebContents::CreateParams to tab helpers.

https://codereview.chromium.org/2894973002

atom/browser/api/atom_api_web_contents.cc

@@ -500,12 +500,14 @@ void WebContents::OnCreateWindow(
     Emit("new-window", target_url, frame_name, disposition, features);
 }
 
-void WebContents::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) {
+void WebContents::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) {
   v8::Locker locker(isolate());
   v8::HandleScope handle_scope(isolate());
   auto api_web_contents = CreateFrom(isolate(), new_contents, BROWSER_WINDOW);

atom/browser/api/atom_api_web_contents.h

@@ -15,6 +15,7 @@
 #include "atom/browser/ui/autofill_popup.h"
 #include "content/common/cursors/webcursor.h"
 #include "content/public/browser/keyboard_event_processing_result.h"
+#include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "content/public/common/favicon_url.h"
 #include "native_mate/handle.h"
@@ -247,12 +248,15 @@ class WebContents : public mate::TrackableObject<WebContents>,
                               const base::string16& message,
                               int32_t line_no,
                               const base::string16& source_id) 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 AddNewContents(content::WebContents* source,
                       content::WebContents* new_contents,
                       WindowOpenDisposition disposition,