webapk: Avoid overwriting default CreationParams

content/browser/site_instance_impl.h

Index: content/browser/site_instance_impl.h
diff --git a/content/browser/site_instance_impl.h b/content/browser/site_instance_impl.h
index fc2ad85bd30738cf2167cc2bd8735aeebe7ced99..6aeffb6e51eb085284345bf8a7fe77d552750663 100644
--- a/content/browser/site_instance_impl.h
+++ b/content/browser/site_instance_impl.h
@@ -33,11 +33,14 @@ class CONTENT_EXPORT SiteInstanceImpl final : public SiteInstance,
     virtual void RenderProcessGone(SiteInstanceImpl* site_instance) = 0;
   };
 
-  static scoped_refptr<SiteInstanceImpl> Create(
-      BrowserContext* browser_context);
+  // |child_process_param_id| is an opaque id passed to ChildProcessLauncher.
+  // All frames in this site instance will inhert the same id.
+  static scoped_refptr<SiteInstanceImpl> Create(BrowserContext* browser_context,
+                                                int child_process_param_id);
   static scoped_refptr<SiteInstanceImpl> CreateForURL(
       BrowserContext* browser_context,
-      const GURL& url);
+      const GURL& url,
+      int child_process_param_id);
 
   // SiteInstance interface overrides.
   int32_t GetId() override;