Introduce chrome://flags/#network-prediction-options-for-service-worker

content/public/browser/service_worker_context.h

Index: content/public/browser/service_worker_context.h
diff --git a/content/public/browser/service_worker_context.h b/content/public/browser/service_worker_context.h
index 22d13f9bd57ac84e19382a9430fc1a88f20b0199..e0a4074988f9f1594ce5068c249e1095200874fa 100644
--- a/content/public/browser/service_worker_context.h
+++ b/content/public/browser/service_worker_context.h
@@ -14,6 +14,8 @@
 
 namespace content {
 
+class RenderProcessHost;
+
 enum class ServiceWorkerCapability {
   NO_SERVICE_WORKER,
   SERVICE_WORKER_NO_FETCH_HANDLER,
@@ -139,6 +141,16 @@ class ServiceWorkerContext {
   // be called on the UI thread.
   virtual void ClearAllServiceWorkersForTest(const base::Closure& callback) = 0;
 
+  // Starts a Service Worker for |document_url| for a navigation preconnect in
+  // the specified render process |host|. Must be called from the UI thread. The
+  // |callback| will always be called on the UI thread. This method can fail if:
+  //  * No Service Worker was registered for |document_url|.
+  //  * The specified render process is not suitable for loading |document_url|.
+  virtual void StartServiceWorkerForNavigationPreconnect(
+      const GURL& document_url,
+      RenderProcessHost* host,
+      const ResultCallback& callback) = 0;
+
  protected:
   ServiceWorkerContext() {}
   virtual ~ServiceWorkerContext() {}