webapk: Avoid overwriting default CreationParams

content/browser/site_instance_impl.h

 // Copyright (c) 2012 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 CONTENT_BROWSER_SITE_INSTANCE_IMPL_H_
 #define CONTENT_BROWSER_SITE_INSTANCE_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 15 matching lines @@
   class CONTENT_EXPORT Observer {
    public:
     // Called when this SiteInstance transitions to having no active frames,
     // as measured by active_frame_count().
     virtual void ActiveFrameCountIsZero(SiteInstanceImpl* site_instance) {}
 
     // Called when the renderer process of this SiteInstance has exited.
     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;
   bool HasProcess() const override;
   RenderProcessHost* GetProcess() override;
   BrowserContext* GetBrowserContext() const override;
   const GURL& GetSiteURL() const override;
   scoped_refptr<SiteInstance> GetRelatedSiteInstance(const GURL& url) override;
   bool IsRelatedSiteInstance(const SiteInstance* instance) override;
   size_t GetRelatedActiveContentsCount() override;
@@ skipping 135 matching lines @@
   bool is_default_subframe_site_instance_;
 
   base::ObserverList<Observer, true> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(SiteInstanceImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_SITE_INSTANCE_IMPL_H_