PlzNavigate: ensure we don't create extra-processes for ServiceWorkers

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..ca3920802e6eef8bec3c1a3623d459d604c48dd0 100644
--- a/content/browser/site_instance_impl.h
+++ b/content/browser/site_instance_impl.h
@@ -38,6 +38,9 @@ class CONTENT_EXPORT SiteInstanceImpl final : public SiteInstance,
   static scoped_refptr<SiteInstanceImpl> CreateForURL(
       BrowserContext* browser_context,
       const GURL& url);
+  static scoped_refptr<SiteInstanceImpl> FindOrCreateForURL(
+      BrowserContext* browser_context,
+      const GURL& url);
 
   // SiteInstance interface overrides.
   int32_t GetId() override;
@@ -64,6 +67,8 @@ class CONTENT_EXPORT SiteInstanceImpl final : public SiteInstance,
   void SetSite(const GURL& url);
   bool HasSite() const;
 
+  void UsedFor(const GURL& url);
+
   // Returns whether there is currently a related SiteInstance (registered with
   // BrowsingInstance) for the site of the given url.  If so, we should try to
   // avoid dedicating an unused SiteInstance to it (e.g., in a new tab).
@@ -185,6 +190,8 @@ class CONTENT_EXPORT SiteInstanceImpl final : public SiteInstance,
   // be true.
   bool is_default_subframe_site_instance_;
 
+  std::set<std::string> sites_displayed_;
+
   base::ObserverList<Observer, true> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(SiteInstanceImpl);